XF 2.3 Подскажите что за ошибка? Attempt to read property "group_name"

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[B]ErrorException[/B]: [E_WARNING] Attempt to read property "group_name" on null in [B]src/XF/Admin/Controller/StyleController.php[/B] at line [B]392[/B] [LIST=1] [*][B]XF::handlePhpError()[/B] in [B]src/XF/Admin/Controller/StyleController.php[/B] at line [B]392[/B] [*][B]XF\Admin\Controller\StyleController->getPropertiesForGroupRefresh()[/B] in [B]src/XF/Admin/Controller/StyleController.php[/B] at line [B]339[/B] [*][B]XF\Admin\Controller\StyleController->actionStylePropertiesGroup()[/B] in [B]src/XF/Mvc/Dispatcher.php[/B] at line [B]362[/B] [*][B]XF\Mvc\Dispatcher->dispatchClass()[/B] in [B]src/XF/Mvc/Dispatcher.php[/B] at line [B]264[/B] [*][B]XF\Mvc\Dispatcher->dispatchFromMatch()[/B] in [B]src/XF/Mvc/Dispatcher.php[/B] at line [B]121[/B] [*][B]XF\Mvc\Dispatcher->dispatchLoop()[/B] in [B]src/XF/Mvc/Dispatcher.php[/B] at line [B]63[/B] [*][B]XF\Mvc\Dispatcher->run()[/B] in [B]src/XF/App.php[/B] at line [B]2826[/B] [*][B]XF\App->run()[/B] in [B]src/XF.php[/B] at line [B]806[/B] [*][B]XF::runApp()[/B] in [B]admin.php[/B] at line [B]15[/B] [/LIST]