Heya folks! I have this Umb13 site that’s experiencing some issues, our database cache has been corrupt or generally doesn’t feel great. When I go to the Published Status section of the backoffice I see this: [image] I’ve tried hitting the Rebuild button under the Database Cache section, and sin…

So, after some very sweaty and high-stress hours our site is finally back up! I’ll attempt to summarize: After many attempts to try and get Umbraco to rebuild it’s cmsContentNu cache, we cloned the source code from Github and checked out the version tag we’re running (v13.11) to attempt to figure o…

Hi @Pekdon You will need to look at the logs outside of Umbraco. I’m assuming this is causing live site issues, so is it worth a restart and try rebuilding the cache again anyway? Justin

Yes please check the physical text logs, it will tell the exact issue. The log files seem too large that’s why the log viewer is not showing the logs.

Im unsure what to search for, the logfile has over a million lines, but i just searched for the keyword “Panic” and got this: { "@t": "2026-05-20T11:48:50.9050406Z", “@mt”: “Panic, exception while loading cache data.”, “@l”: “Fatal”, “@x”: “System.InvalidOperationException: No data for media 16…

[image] Mathias Andreasen: 1612 If you go into the media library and amend the URL to load 1612, does it give you any errors and/or load the media? https://www.yourdomain.com/umbraco#/media/media/edit/1612 I would start there if it thinks something is corrupt or wrong… Also, are you able t…

im working on grabbing the database backup! i went to the media/edit/1612, it’s just a nromal folder in the media library and didn’t give me any errors

My AI agent tells me that we need the cmsContentNu cache to be rebuilt and that’s what’s causing the issues.

Hi @Pekdon This is what I get from AI, maybe helpful: I’d gently push back on what your AI agent is telling you — I think it has cause and effect reversed. cmsContentNu is the output of the rebuild process, not the input. The rebuild populates it by reading from umbracoNode, umbracoContent, umbra…

SELECT id, nodeObjectType, parentId, [text] FROM umbracoNode WHERE id = 1612; id nodeObjectType parentId text 1612 B796F64C-1F99-4FFB-B886-4BF4BC011A9C -1 <HIDING THIS FOR SAFETY> SELECT nodeId, contentTypeId FROM umbracoContent WHERE nodeId = 1612; nodeId contentTypeId 1612 1031 SELECT id, …

Around the 5th of May, we restored some umbraco property data rows from an old backup, some images had been removed because some fields where switching between being culture invariants and culture variated

Hi @Pekdon Ah, that sounds like it may be the root cause. Could restoring old property values have caused this if that was done directly on the database? If you’ve bypassed the API, then you may be missing data or versions required elsewhere that completes the picture. Are you able to double che…

Unable to rebuild database cache

Questions

Pekdon (Mathias Andreasen) May 20, 2026, 1:38pm 27

Here’s the “root cause” that I think caused all this