fix: fixed bug in internal/event which caused a crash on startup

[subscorp]

There is a bug that causes the site to fail on startup. I found a solution here:
OWASP/pytm#114

[codecov-io]

Codecov Report

Merging #345 (3cd150a) into develop (8d83f8b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #345   +/-   ##
========================================
  Coverage    94.39%   94.39%           
========================================
  Files           89       89           
  Lines         4156     4156           
========================================
  Hits          3923     3923           
  Misses         233      233           

Impacted Files	Coverage Δ
app/internal/event.py	96.62% <100.00%> (ø)

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