MyBB Community Forums

The title quiet explains everything. I am getting this error after I updated to 1.8.1.
What do you think is causing this?

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And yes, that user exists.

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Solved that, apparently I only had to delete a buggy user (displaying 0 at "last seen").

İ have same problem , what is buggy user

^ what is your forum url & which theme you are using ?

run file verification tool from below location. what does it report ?
forum admin panel >> tools & maintenance >> file verification

ignore reported images & ignore files reported from install folder & its sub-folders