XF 2.2 Erroneous Conversation notification icons for many users

[Kwaka]

Hi,
I did search, but I couldn't find any question like mine. I am on the latest build 2.2.15. For some time now some users have been complaining that the Conversation icon is indicating that they have 1 message, and when they click on it they get an error. See image examples below. I hoped it would go away by moving to the latest upgrade... it hasn't.


and when you click on it:


How can I resolve this?
It's for multiple users.

Thanks for any help.

 

[Paul B]

The first step is to disable all third party add-ons, revert to a completely default style, and remove any custom JS and caching.

It's not something which has been reported previously so likely it's due to something third party.

 

[Kwaka]

Right just to say this is sorted now.
A massive thank you to M@rc for helping me initially to rule out any addons and style or custom issues, and then to AndyB who persisted to track down what was a historical DB corruption issue that had left some orphaned rows in the conversations tables. AndyB wrote a few addons which diagnosed the issue and then corrected it for me. Thank you so much.