Updated 500 error handler and test coverage

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3a3dbfe) 97.40% compared to head (3bebc9d) 97.42%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #118 +/- ## ========================================== + Coverage 97.40% 97.42% +0.01% ========================================== Files 8 8 Lines 540 544 +4 ========================================== + Hits 526 530 +4 Misses 14 14 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.