[image] Randomly my forum wen’t down and then when I brought it back up (rebuilt it) this is what is occuring.

A couple options to figure out which one is causing the problem: Visit the theme settings via safe mode and try previewing each theme/component until you find one that causes the problem Disable theme components one at a time and check to see if that fixes your site

First step to debugging would be checking the browser console for errors… it appears to possibly be an issue with the who’s online plugin… is it up-to-date? maybe try disabling it and see if the issue resolves [image] You can circumvent this issue temporarily and access your site by using safe mode

Safe mode seems to only work when [image] is enabled. I disabled the whos online plugin and same issue.

@Headless I see you marked this as solved, which is great! Were you able to identify the problematic theme component? If it’s a public one, please can you let us know which it was, so we can make sure this doesn’t cause issues for other people?

It seemed to have been the following components for the theme: Topic List Previews and Custom Header Links - Theme component - Discourse Meta

Ok great, thanks! We’re debugging a potential issue over in this topic. If you have the time to try running those commands, then it might solve the problem and allow you to reenable those theme components.

I wen’t ahead and did the steps in this post: Rendering 'TypeError' with theme components after update - #10 by david I can confirm this fixed the issue, turned the components back on and no issues.

Perfect, thanks for your help identifying the problem @Headless!

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Product Support

Headless (Headless) September 2, 2025, 7:25pm 10

Thank you for swift support!

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