# Error 500 when moving posts

**URL:** https://meta.discourse.org/t/error-500-when-moving-posts/397654
**Category:** Bug
**Created:** [March 4, 2026, 8:14pm UTC](https://meta.discourse.org/t/error-500-when-moving-posts/397654 "2026-03-04T20:14:16Z")
**Posts on this page:** 1
**Showing post:** 1

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### Author: ![Thomas\_Rother](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/thomas_rother/32/423597_2.png) [@Thomas\_Rother](https://meta.discourse.org/u/Thomas_Rother)
#### Post date: [March 4, 2026, 8:14pm UTC](https://meta.discourse.org/t/error-500-when-moving-posts/397654/1 "2026-03-04T20:14:16Z")

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Moving a single or multiple posts of a thread into another thread located in another category results in http 500 error. I tested with both a moderator and admin account and with both a single post or multiple selected posts. Permission matrix of the categories:

| Category | Group | Permissions |
| --- | --- | --- |
| Source | anybody | see |
| Source | group01 | see reply create |
| Target | group01 | see reply create |

~~Note that we have we have a separate permission group for mods and admins and~~ I assume that the root cause is some tricky permissions issue. Ideas how to debug this are welcome 😎

**Update:** The source catogory in federated (ActivityPub), maybe this plugin code plays a role too… I removed the separate permission groups for mods and admins and tested again with two accounts which have “standard” mod (Moderator = Yes) or admin (Admin = Yes) permissions. Same results: The error 500 appears for any use case: new topic, existing topic, new message.

❕ **Note:** This bug was already reported a few times earlier and there were already some code fixes. I see it again in our instance with the **current** release 2026.3.0-latest

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