Null pointer exception trying to decompile DLL in latest build

[avengerx]

Steps to reproduce

Follow the steps in issue #2622

1. Downdload and extract (7zip works): KB5007409 exchange patch from microsoft website
2. Decompile Microsoft.Exchange.Monitoring.ActiveMonitoring.Local.Components.dll into a project using ILSpy
   2.1. ILSpy GUI:
   2.1.1. Open the DLL
   2.1.2. Right click it
   2.1.3. Click "Save Code" and choose a target directory
   2.2. ILSpyCmd:
   2.2.1. Change to the directory where you extracted the .msp file and:

mkdir k
cd k
ilspycmd --languageversion latest --outputdir . --project --use-varnames-from-pdb --nested-directories ../Microsoft.Exchange.Monitoring.ActiveMonitoring.Local.Components.dll

Error message shown

Release

Error decompiling @06000735 Microsoft.Office.Datacenter.ActiveMonitoring.ActiveMonitoring.MonitoringMailboxCleaner.CreateDefinition
in assembly "A:\games\stpt\ilspy\issue2622\Exchange2019-KB5007409-x64-en\Microsoft.Exchange.Monitoring.ActiveMonitoring.Local.Components.dll"
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at ICSharpCode.Decompiler.CSharp.CallBuilder.BuildArgumentList(ExpectedTargetDetails expectedTargetDetails, ResolveResult target, IMethod method, Int32 firstParamIndex, IReadOnlyList`1 callArguments, IReadOnlyList`1 argumentToParameterMap) in CallBuilder.cs:line 710
   at ICSharpCode.Decompiler.CSharp.CallBuilder.BuildDictionaryInitializerExpression(OpCode callOpCode, IMethod method, InitializedObjectResolveResult target, IReadOnlyList`1 indices, ILInstruction value) in CallBuilder.cs:line 539
(...)

Debug

Process terminated. Assertion failed.
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.BuildArrayInitializerExpression(Block block, InitializedObjectResolveResult initObjRR) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 3247
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.TranslateObjectAndCollectionInitializer(Block block) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 3182
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitBlock(Block block, TranslationContext context) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 3111
   at ICSharpCode.Decompiler.IL.Block.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\IL\Instructions.cs:line 876
(...)

Details

• I found this while trying to reproduce issue reported in Crash when Attempting to Decompile Microsoft.Exchange.Monitoring.ActiveMonitoring.Local.Components.dll And Stops All Decompilation #2622 while checking issue Filenames and directories truncated to 30 characters #2706 implementation
• This is reproducible only in current versions, perhaps 8.x.x. 7.2.1.6856 successfully decompiles the project.
• Products: ILSpy GUI and ILSpyCmd (both reproduced the same error)
• Versions affected: 8.0.0.7048 (current master, 107a5b5)
• Versions not affected: 7.2.1.6856

[avengerx]

Here's the full exception text:

System.AggregateException: One or more errors occurred. (Error decompiling @06000735 Microsoft.Office.Datacenter.ActiveMonitoring.ActiveMonitoring.MonitoringMailboxCleaner.CreateDefinition) (Error decompiling @0600077E Microsoft.Exchange.Monitoring.PassiveMonitoring.Common.PassiveCommonDiscovery.CreateInventoryCacheProbe)
 ---> Error decompiling @06000735 Microsoft.Office.Datacenter.ActiveMonitoring.ActiveMonitoring.MonitoringMailboxCleaner.CreateDefinition
in assembly "../Microsoft.Exchange.Monitoring.ActiveMonitoring.Local.Components.dll"
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at ICSharpCode.Decompiler.CSharp.CallBuilder.BuildArgumentList(ExpectedTargetDetails expectedTargetDetails, ResolveResult target, IMethod method, Int32 firstParamIndex, IReadOnlyList`1 callArguments, IReadOnlyList`1 argumentToParameterMap) in CallBuilder.cs:line 710
   at ICSharpCode.Decompiler.CSharp.CallBuilder.BuildDictionaryInitializerExpression(OpCode callOpCode, IMethod method, InitializedObjectResolveResult target, IReadOnlyList`1 indices, ILInstruction value) in CallBuilder.cs:line 539
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.BuildArrayInitializerExpression(Block block, InitializedObjectResolveResult initObjRR) in ExpressionBuilder.cs:line 3188
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.TranslateObjectAndCollectionInitializer(Block block) in ExpressionBuilder.cs:line 3182
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitBlock(Block block, TranslationContext context) in ExpressionBuilder.cs:line 3111
   at ICSharpCode.Decompiler.IL.Block.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in Instructions.cs:line 876
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.Translate(ILInstruction inst, IType typeHint) in ExpressionBuilder.cs:line 161
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitConv(Conv inst, TranslationContext context) in ExpressionBuilder.cs:line 2020
   at ICSharpCode.Decompiler.IL.Conv.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in Instructions.cs:line 2275
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.Translate(ILInstruction inst, IType typeHint) in ExpressionBuilder.cs:line 161
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.VisitLeave(Leave inst) in StatementBuilder.cs:line 383
   at ICSharpCode.Decompiler.IL.Leave.AcceptVisitor[T](ILVisitor`1 visitor) in Instructions.cs:line 1316
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.Convert(ILInstruction inst) in StatementBuilder.cs:line 78
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertBlockContainer(BlockStatement blockStatement, BlockContainer container, IEnumerable`1 blocks, Boolean isLoop) in StatementBuilder.cs:line 1395
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertBlockContainer(BlockContainer container, Boolean isLoop) in StatementBuilder.cs:line 1333
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.VisitBlockContainer(BlockContainer container) in StatementBuilder.cs:line 1219
   at ICSharpCode.Decompiler.IL.BlockContainer.AcceptVisitor[T](ILVisitor`1 visitor) in Instructions.cs:line 847
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.Convert(ILInstruction inst) in StatementBuilder.cs:line 78
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertAsBlock(ILInstruction inst) in StatementBuilder.cs:line 83
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1694
-- continuing with outer exception (ICSharpCode.Decompiler.DecompilerException) --
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1718
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(IMethod method, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1567
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.<>c__DisplayClass70_0.<DoDecompile>g__DoDecompileMember|0(IEntity entity, RecordDecompiler recordDecompiler) in CSharpDecompiler.cs:line 1434
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(ITypeDefinition typeDef, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1328
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompileTypes(IEnumerable`1 types, DecompileRun decompileRun, ITypeResolveContext decompilationContext, SyntaxTree syntaxTree) in CSharpDecompiler.cs:line 620
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileTypes(IEnumerable`1 types) in CSharpDecompiler.cs:line 928
   at ICSharpCode.Decompiler.CSharp.ProjectDecompiler.WholeProjectDecompiler.<>c__DisplayClass45_0.<WriteCodeFilesInProject>b__2(IGrouping`2 file) in WholeProjectDecompiler.cs:line 239
   at System.Threading.Tasks.Parallel.<>c__DisplayClass44_0`2.<PartitionerForEachWorker>b__1(IEnumerator& partitionState, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion) in offset 259
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() in offset 17
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Exception source) in offset 0
   at System.Threading.Tasks.Parallel.<>c__DisplayClass44_0`2.<PartitionerForEachWorker>b__1(IEnumerator& partitionState, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion) in offset 609
   at System.Threading.Tasks.TaskReplicator.Replica`1.ExecuteAction(Boolean& yieldedBeforeCompletion) in offset 0
   at System.Threading.Tasks.TaskReplicator.Replica.Execute() in offset 0
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.TaskReplicator.Run[TState](ReplicatableUserAction`1 action, ParallelOptions options, Boolean stopOnFirstFailure)
   at System.Threading.Tasks.Parallel.PartitionerForEachWorker[TSource,TLocal](Partitioner`1 source, ParallelOptions parallelOptions, Action`1 simpleBody, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.ThrowSingleCancellationExceptionOrOtherException(ICollection exceptions, CancellationToken cancelToken, Exception otherException)
   at System.Threading.Tasks.Parallel.PartitionerForEachWorker[TSource,TLocal](Partitioner`1 source, ParallelOptions parallelOptions, Action`1 simpleBody, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.ForEach[TSource](Partitioner`1 source, ParallelOptions parallelOptions, Action`1 body)
   at ICSharpCode.Decompiler.CSharp.ProjectDecompiler.WholeProjectDecompiler.WriteCodeFilesInProject(PEFile module, CancellationToken cancellationToken) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ProjectDecompiler\WholeProjectDecompiler.cs:line 226
   at ICSharpCode.Decompiler.CSharp.ProjectDecompiler.WholeProjectDecompiler.DecompileProject(PEFile moduleDefinition, String targetDirectory, TextWriter projectFileWriter, CancellationToken cancellationToken) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ProjectDecompiler\WholeProjectDecompiler.cs:line 150
   at ICSharpCode.ILSpyCmd.ILSpyCmdProgram.DecompileAsProject(String assemblyFileName, String projectFileName) in A:\games\stpt\ilspy\src\ICSharpCode.ILSpyCmd\IlspyCmdProgram.cs:line 276
   at ICSharpCode.ILSpyCmd.ILSpyCmdProgram.OnExecute(CommandLineApplication app) in A:\games\stpt\ilspy\src\ICSharpCode.ILSpyCmd\IlspyCmdProgram.cs:line 0
 ---> (Inner Exception #1) Error decompiling @0600077E Microsoft.Exchange.Monitoring.PassiveMonitoring.Common.PassiveCommonDiscovery.CreateInventoryCacheProbe
in assembly "../Microsoft.Exchange.Monitoring.ActiveMonitoring.Local.Components.dll"
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at ICSharpCode.Decompiler.CSharp.CallBuilder.BuildArgumentList(ExpectedTargetDetails expectedTargetDetails, ResolveResult target, IMethod method, Int32 firstParamIndex, IReadOnlyList`1 callArguments, IReadOnlyList`1 argumentToParameterMap) in CallBuilder.cs:line 710
   at ICSharpCode.Decompiler.CSharp.CallBuilder.BuildDictionaryInitializerExpression(OpCode callOpCode, IMethod method, InitializedObjectResolveResult target, IReadOnlyList`1 indices, ILInstruction value) in CallBuilder.cs:line 539
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.BuildArrayInitializerExpression(Block block, InitializedObjectResolveResult initObjRR) in ExpressionBuilder.cs:line 3188
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.TranslateObjectAndCollectionInitializer(Block block) in ExpressionBuilder.cs:line 3182
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitBlock(Block block, TranslationContext context) in ExpressionBuilder.cs:line 3111
   at ICSharpCode.Decompiler.IL.Block.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in Instructions.cs:line 876
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.Translate(ILInstruction inst, IType typeHint) in ExpressionBuilder.cs:line 161
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitConv(Conv inst, TranslationContext context) in ExpressionBuilder.cs:line 2020
   at ICSharpCode.Decompiler.IL.Conv.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in Instructions.cs:line 2275
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.Translate(ILInstruction inst, IType typeHint) in ExpressionBuilder.cs:line 161
   at ICSharpCode.Decompiler.CSharp.CallBuilder.BuildArgumentList(ExpectedTargetDetails expectedTargetDetails, ResolveResult target, IMethod method, Int32 firstParamIndex, IReadOnlyList`1 callArguments, IReadOnlyList`1 argumentToParameterMap) in CallBuilder.cs:line 745
   at ICSharpCode.Decompiler.CSharp.CallBuilder.Build(OpCode callOpCode, IMethod method, IReadOnlyList`1 callArguments, IReadOnlyList`1 argumentToParameterMap, IType constrainedTo) in CallBuilder.cs:line 289
   at ICSharpCode.Decompiler.CSharp.CallBuilder.Build(CallInstruction inst) in CallBuilder.cs:line 217
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitCallVirt(CallVirt inst, TranslationContext context) in ExpressionBuilder.cs:line 2248
   at ICSharpCode.Decompiler.IL.CallVirt.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in Instructions.cs:line 2193
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.Translate(ILInstruction inst, IType typeHint) in ExpressionBuilder.cs:line 161
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.Default(ILInstruction inst) in StatementBuilder.cs:line 89
   at ICSharpCode.Decompiler.IL.ILVisitor`1.VisitCallVirt(CallVirt inst) in Instructions.cs:line 7298
   at ICSharpCode.Decompiler.IL.CallVirt.AcceptVisitor[T](ILVisitor`1 visitor) in Instructions.cs:line 2189
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.Convert(ILInstruction inst) in StatementBuilder.cs:line 78
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertBlockContainer(BlockStatement blockStatement, BlockContainer container, IEnumerable`1 blocks, Boolean isLoop) in StatementBuilder.cs:line 1395
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertBlockContainer(BlockContainer container, Boolean isLoop) in StatementBuilder.cs:line 1333
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.VisitBlockContainer(BlockContainer container) in StatementBuilder.cs:line 1219
   at ICSharpCode.Decompiler.IL.BlockContainer.AcceptVisitor[T](ILVisitor`1 visitor) in Instructions.cs:line 847
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.Convert(ILInstruction inst) in StatementBuilder.cs:line 78
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertAsBlock(ILInstruction inst) in StatementBuilder.cs:line 83
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1694
-- continuing with outer exception (ICSharpCode.Decompiler.DecompilerException) --
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1718
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(IMethod method, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1567
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.<>c__DisplayClass70_0.<DoDecompile>g__DoDecompileMember|0(IEntity entity, RecordDecompiler recordDecompiler) in CSharpDecompiler.cs:line 1434
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(ITypeDefinition typeDef, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1328
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompileTypes(IEnumerable`1 types, DecompileRun decompileRun, ITypeResolveContext decompilationContext, SyntaxTree syntaxTree) in CSharpDecompiler.cs:line 620
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileTypes(IEnumerable`1 types) in CSharpDecompiler.cs:line 928
   at ICSharpCode.Decompiler.CSharp.ProjectDecompiler.WholeProjectDecompiler.<>c__DisplayClass45_0.<WriteCodeFilesInProject>b__2(IGrouping`2 file) in WholeProjectDecompiler.cs:line 239
   at System.Threading.Tasks.Parallel.<>c__DisplayClass44_0`2.<PartitionerForEachWorker>b__1(IEnumerator& partitionState, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion) in offset 259
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() in offset 17
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Exception source) in offset 0
   at System.Threading.Tasks.Parallel.<>c__DisplayClass44_0`2.<PartitionerForEachWorker>b__1(IEnumerator& partitionState, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion) in offset 609
   at System.Threading.Tasks.TaskReplicator.Replica`1.ExecuteAction(Boolean& yieldedBeforeCompletion) in offset 0
   at System.Threading.Tasks.TaskReplicator.Replica.Execute() in offset 0<---

[avengerx]

The call stack points at CallBuilder:539, and then ExpressionBuilder:3188, but the actual call happens in ExpressionBuilder:3250... So yeah, built in Debug configuration and now the exception says:

Process terminated. Assertion failed.
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.BuildArrayInitializerExpression(Block block, InitializedObjectResolveResult initObjRR) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 3247
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.TranslateObjectAndCollectionInitializer(Block block) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 3182
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitBlock(Block block, TranslationContext context) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 3111
   at ICSharpCode.Decompiler.IL.Block.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\IL\Instructions.cs:line 876
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.Translate(ILInstruction inst, IType typeHint) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 161
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitConv(Conv inst, TranslationContext context) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 2020
   at ICSharpCode.Decompiler.IL.Conv.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\IL\Instructions.cs:line 2275
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.Translate(ILInstruction inst, IType typeHint) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 161
   at ICSharpCode.Decompiler.CSharp.CallBuilder.BuildArgumentList(ExpectedTargetDetails expectedTargetDetails, ResolveResult target, IMethod method, Int32 firstParamIndex, IReadOnlyList`1 callArguments, IReadOnlyList`1 argumentToParameterMap) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CallBuilder.cs:line 745
   at ICSharpCode.Decompiler.CSharp.CallBuilder.Build(OpCode callOpCode, IMethod method, IReadOnlyList`1 callArguments, IReadOnlyList`1 argumentToParameterMap, IType constrainedTo) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CallBuilder.cs:line 289
   at ICSharpCode.Decompiler.CSharp.CallBuilder.Build(CallInstruction inst) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CallBuilder.cs:line 217
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.VisitCallVirt(CallVirt inst, TranslationContext context) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 2248
   at ICSharpCode.Decompiler.IL.CallVirt.AcceptVisitor[C,T](ILVisitor`2 visitor, C context) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\IL\Instructions.cs:line 2193
   at ICSharpCode.Decompiler.CSharp.ExpressionBuilder.Translate(ILInstruction inst, IType typeHint) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ExpressionBuilder.cs:line 161
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.Default(ILInstruction inst) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\StatementBuilder.cs:line 89
   at ICSharpCode.Decompiler.IL.ILVisitor`1.VisitCallVirt(CallVirt inst) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\IL\Instructions.cs:line 7298
   at ICSharpCode.Decompiler.IL.CallVirt.AcceptVisitor[T](ILVisitor`1 visitor) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\IL\Instructions.cs:line 2189
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.Convert(ILInstruction inst) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\StatementBuilder.cs:line 78
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertBlockContainer(BlockStatement blockStatement, BlockContainer container, IEnumerable`1 blocks, Boolean isLoop) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\StatementBuilder.cs:line 1403
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertBlockContainer(BlockContainer container, Boolean isLoop) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\StatementBuilder.cs:line 1333
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.VisitBlockContainer(BlockContainer container) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\StatementBuilder.cs:line 1219
   at ICSharpCode.Decompiler.IL.BlockContainer.AcceptVisitor[T](ILVisitor`1 visitor) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\IL\Instructions.cs:line 847
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.Convert(ILInstruction inst) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\StatementBuilder.cs:line 78
   at ICSharpCode.Decompiler.CSharp.StatementBuilder.ConvertAsBlock(ILInstruction inst) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\StatementBuilder.cs:line 83
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CSharpDecompiler.cs:line 1702
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(IMethod method, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CSharpDecompiler.cs:line 1567
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.<>c__DisplayClass70_0.<DoDecompile>g__DoDecompileMember|0(IEntity entity, RecordDecompiler recordDecompiler) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CSharpDecompiler.cs:line 1434
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(ITypeDefinition typeDef, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CSharpDecompiler.cs:line 1328
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompileTypes(IEnumerable`1 types, DecompileRun decompileRun, ITypeResolveContext decompilationContext, SyntaxTree syntaxTree) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CSharpDecompiler.cs:line 620
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileTypes(IEnumerable`1 types) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\CSharpDecompiler.cs:line 928
   at ICSharpCode.Decompiler.CSharp.ProjectDecompiler.WholeProjectDecompiler.<>c__DisplayClass45_0.<WriteCodeFilesInProject>b__2(IGrouping`2 file) in A:\games\stpt\ilspy\src\ICSharpCode.Decompiler\CSharp\ProjectDecompiler\WholeProjectDecompiler.cs:line 239
   at System.Threading.Tasks.Parallel.<>c__DisplayClass44_0`2.<PartitionerForEachWorker>b__1(IEnumerator& partitionState, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
   at System.Threading.Tasks.TaskReplicator.Replica`1.ExecuteAction(Boolean& yieldedBeforeCompletion)
   at System.Threading.Tasks.TaskReplicator.Replica.Execute()
   at System.Threading.Tasks.TaskReplicator.Replica.<>c.<Execute>b__7_0(Object s)
   at System.Threading.Tasks.Task.InnerInvoke()
   at System.Threading.Tasks.Task.<>c.<.cctor>b__272_0(Object obj)
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
   at System.Threading.Tasks.Task.ExecuteEntryUnsafe(Thread threadPoolThread)
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
   at System.Threading.Thread.StartCallback()

Which seems to be much more helpful. :)

[siegfriedpammer]

Thanks a lot for reporting the issue and providing detailed information!

[avengerx]

I confirm the fix resolved the issue and I can now decompile that assembly to completion!