Warning: Parameter 1 to PlgSystemRedirect::handleError() expected to be a reference, value given in Unknown on line 0

Fatal error: Uncaught Error: Call to a member function isAdmin() on null in /www/htdocs/w01051f5/plugins/system/remember/remember.php:42 Stack trace: #0 /www/htdocs/w01051f5/libraries/joomla/event/event.php(71): PlgSystemRemember->onAfterInitialise() #1 /www/htdocs/w01051f5/libraries/joomla/event/dispatcher.php(162): JEvent->update(Array) #2 /www/htdocs/w01051f5/libraries/joomla/application/base.php(106): JEventDispatcher->trigger('onafterinitiali...', Array) #3 /www/htdocs/w01051f5/libraries/cms/application/cms.php(587): JApplicationBase->triggerEvent('onAfterInitiali...') #4 /www/htdocs/w01051f5/libraries/cms/application/site.php(620): JApplicationCms->initialiseApp(Array) #5 /www/htdocs/w01051f5/libraries/cms/application/site.php(196): JApplicationSite->initialiseApp() #6 /www/htdocs/w01051f5/libraries/cms/application/cms.php(255): JApplicationSite->doExecute() #7 /www/htdocs/w01051f5/index.php(40): JApplicationCms->execute() #8 {main} thrown in /www/htdocs/w01051f5/plugins/system/remember/remember.php on line 42