See stacktrace.
Read logs and see what happened.
Try to reproduce.
Use debugger to see what happens in code.
Fix.
Test locally.
Code review.
Commit.
Test on test environment.
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See stacktrace.
Read logs and see what happened.
Try to reproduce.
Use debugger to see what happens in code.
Fix.
Test locally.
Code review.
Commit.
Test on test environment.