### Steps to reproduce

* Begin of the insertionCreate a relation between 2 work packages

End of the insertion Begin of the deletion Unclear - AppSignal report

End of the deletion * Begin of the insertionOpenEnd of the insertion Begin of the deletion ProbablyEnd of the deletion the Begin of the insertionsame work package in two different browser tabs, both displaying the relations tab for the same work package.

* Delete theEnd of the insertion Begin of the deletion user is trying to delete aEnd of the deletion relation Begin of the insertionin the first browser tab

* Delete the same relation in the other browser tab


End of the insertion Begin of the deletion already deleted e.g. by using multiple tabs or double clicking


End of the deletion ### What is the buggy behavior?

Begin of the insertion500 error, but the frontend does not show any signs of this error (so it's invisible to users, we only detected it thanks to appsignal)End of the insertion Begin of the deletion Unclear - AppSignal reportEnd of the deletion

### What is the expected behavior?

Begin of the insertionNo 500 error

### ScreenshotsEnd of the insertion Begin of the deletion Unclear - AppSignal reportEnd of the deletion

### **Logs**

[https://appsignal.com/openproject-gmbh/sites/632371afd2a5e463ef717ecb/exceptions/incidents/6513](https://appsignal.com/openproject-gmbh/sites/632371afd2a5e463ef717ecb/exceptions/incidents/6513)

[https://appsignal.com/openproject-gmbh/sites/673c8be183eb67dcd6c4e75d/exceptions/incidents/1212](https://appsignal.com/openproject-gmbh/sites/673c8be183eb67dcd6c4e75d/exceptions/incidents/1212)

https://appsignal.com/openproject-gmbh/sites/673c8d4183eb67dcd6c4e764/exceptions/incidents/1132

```text
Couldn't find Relation with 'id'=1567 [WHERE ("relations"."from_id" = $1 OR "relations"."to_id" = $2)]

app/controllers/work_package_relations_controller.rb:118 WorkPackageRelationsController#set_relation

Parameters:

{
"_method": "delete",
"action": "destroy",
"authenticity_token": "[FILTERED]",
"controller": "work_package_relations",
"id": "29349",
"work_package_id": "6362"
}
```