### Steps to reproduce

1. Log in as a user who can edit meetings

2. Go to the Meetings module

3. Begin of the insertionCreate aEnd of the insertion Begin of the deletion Edit an existingEnd of the deletion meeting series that Begin of the insertionends some occurrences in the future (e.g. 10)

4. Open multiple meetings (e.g. 4)

5. Edit the meeting seriesEnd of the insertion Begin of the deletion is set upEnd of the deletion to Begin of the insertionhave fewerEnd of the insertion Begin of the deletion end after a specific date and change it to any number ofEnd of the deletion occurrences Begin of the insertionthan the number opened in the above step (e.g. 2)End of the insertion


### What is the buggy behavior?

* User sees a 500 error

* User can't access meeting series Begin of the insertionanymore End of the insertion Begin of the deletion anymoreEnd of the deletion


### What is the expected behavior?

1. No error

2. User has access to the meeting series


### Note

while poking around i noticed that: Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion [https://qa.openproject-edge.com/recurring\_meetings/31?direction=past](https://qa.openproject-edge.com/recurring_meetings/31?direction=past) all good
[https://qa.openproject-edge.com/recurring\_meetings/31](https://qa.openproject-edge.com/recurring_meetings/31) 500

### Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/310162/content">

### Environment information

**OpenProject version**

Core build

[fe73c08123ffb0052b48e6d4048f06e232af59ae](https://github.com/opf/openproject/commits/fe73c08123ffb0052b48e6d4048f06e232af59ae)

Product version

[8950dfe92bf34bd6dfcab51a36e211e8a7541c5a](https://github.com/opf/saas-openproject/commits/8950dfe92bf34bd6dfcab51a36e211e8a7541c5a)

Core version

OpenProject 15.3.0

**Browser**

* [ ] Chrome
* [x] Firefox 134.0.2
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [x] Windows 11Pro
* [ ] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)

**Language**

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