in your config php add this
define('DISABLE_HOOKS', true);
this fixxed it for me than uninstall the mod ]
it should look like this
ini_set('display_errors', true);
define('DISABLE_HOOKS', 1); <--------add it here
// ****** DATABASE TYPE ******
// This is the type of the database server on which your vBulletin database will be located.
// Valid options are mysql and mysqli, for slave support add _slave. Try to use xxxx if you are using PHP 5 and MySQL 4.1+
// for slave options just append _slave to your preferred database type.
That will disable all mods, and then you can delete the mod that is causing the problem. For me the problem was the VB Optimise Mod.
for more info on that:
https://vborg.vbsupport.ru/showthrea...199207&page=44