Begin of the insertion**AppSignal application: eu-community**
End of the insertion **Message**

Begin of the insertion```textEnd of the insertion Begin of the deletion ```End of the deletion
no implicit conversion of nil into String
```

**Backtrace (last 10 lines)**

Begin of the insertion```textEnd of the insertion Begin of the deletion ```End of the deletion
modules/gitlab_integration/lib/open_project/gitlab_integration/notification_handler/merge_request_hook.rb:51 +
modules/gitlab_integration/lib/open_project/gitlab_integration/notification_handler/merge_request_hook.rb:51 process
modules/gitlab_integration/lib/open_project/gitlab_integration/notification_handlers.rb:44 block in merge_request_hook
modules/gitlab_integration/lib/open_project/gitlab_integration/notification_handlers.rb:81 with_logging
modules/gitlab_integration/lib/open_project/gitlab_integration/notification_handlers.rb:43 merge_request_hook
lib_static/open_project/notifications.rb:57 block in subscribe
lib/active_support/notifications/fanout.rb:137 block in finish
lib/active_support/notifications/fanout.rb:26 block in iterate_guarding_exceptions
lib/active_support/notifications/fanout.rb:25 each
lib/active_support/notifications/fanout.rb:25 iterate_guarding_exceptions
```

View on AppSignal: https://appsignal.com/openproject-gmbh/sites/62b06dacd2a5e41321946fcf/exceptions/incidents/699