@DawPi
Jestem blisko rozwiązania gdyż ludzie z hostingu trochę nakierowali całą sprawę. Taki error występuje przy wchodzeniu w profil osoby:
Error: Call to a member function userAgent() on null (0)
#0 l/public_html/system/Theme/SandboxedTemplate.php(56): IPS\Theme\class_core_front_profile->profileHeader(Object(IPS\Member), false)
#1 /public_html/system/Theme/Theme.php(824) : eval()'d code(1279): IPS\Theme\_SandboxedTemplate->__call('profileHeader', Array)
#2 /public_html/system/Theme/SandboxedTemplate.php(56): IPS\Theme\class_core_front_profile->profile(Object(IPS\Member), '\n\n\t<div class="...', Array, Array, Object(IPS\Db\Select), Object(IPS\Http\Url\Friendly))
#3 /public_html/applications/core/modules/front/members/profile.php(417): IPS\Theme\_SandboxedTemplate->__call('profile', Array)
#4 /system/Dispatcher/Controller.php(96): IPS\core\modules\front\members\_profile->manage()
#5 /public_html/applications/core/modules/front/members/profile.php(64): IPS\Dispatcher\_Controller->execute()
#6 /public_html/system/Dispatcher/Dispatcher.php(146): IPS\core\modules\front\members\_profile->execute()
#7 /public_html/index.php(12): IPS\_Dispatcher->run()
#8 {main}