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(1/1) ContextErrorException

Notice: Trying to access array offset on value of type null

in facebookconversiontrackingplus.php line 1749
at FacebookConversionTrackingPlus->printPixels()in facebookconversiontrackingplus.php line 1925
at FacebookConversionTrackingPlus->hookDisplayHeader()in Hook.php line 1007
at HookCore::coreCallHook()in Hook.php line 431
at HookCore::callHookOn()in Hook.php line 944
at HookCore::exec()in FrontController.php line 598
at FrontControllerCore->initContent()in CategoryController.php line 137
at CategoryControllerCore->initContent()in Controller.php line 306
at ControllerCore->run()in Dispatcher.php line 518
at DispatcherCore->dispatch()in index.php line 28