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2 changes: 1 addition & 1 deletion src/Orchard.Web/Core/Shapes/CoreShapes.cs
Original file line number Diff line number Diff line change
Expand Up @@ -283,7 +283,7 @@ public void Zone(dynamic Display, dynamic Shape, TextWriter Output) {
[Shape]
public void ContentZone(dynamic Display, dynamic Shape, TextWriter Output) {
var unordered = ((IEnumerable<dynamic>)Shape).ToArray();
var tabbed = unordered.GroupBy(x => (string)x.Metadata.Tab);
var tabbed = unordered.GroupBy(x => (string)x.Metadata.Tab ?? "");

if (tabbed.Count() > 1) {
foreach (var tab in tabbed) {
Expand Down