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Error : TypeError: Argument 1 passed to MyTextSanitizer::htmlSpecialChars() must be of the type string, null given, called in /include/functions.php on line 968

Backtrace:
/include/functions.php (968)
/kernel/user.php (269)
/modules/newbb/class/User.php (240)
/modules/newbb/class/UserHandler.php (54)
/modules/newbb/class/UserHandler.php (108)
/modules/newbb/viewtopic.php (289)