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(1/1) ContextErrorException

Notice: Undefined offset: 0

in ProductListingFrontController.php line 213
at ProductListingFrontController->getProductSearchVariables()in ProductListingFrontController.php line 611
at ProductListingFrontControllerCore->doProductSearch('catalog/listing/category', array('entity' => 'category', 'id' => 24))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