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(1/1) ContextErrorException

Notice: Undefined index: url_name

in Filter.php line 100
at Filter->getProperty('url_name')in URLSerializer.php line 142
at URLSerializer->getFilterLabel(object(Filter))in URLSerializer.php line 41
at URLSerializer->addFilterToFacetFilters(array(), object(Filter), object(Facet))in SearchProvider.php line 425
at SearchProvider->addEncodedFacetsToFilters(array(object(Facet), object(Facet), object(Facet)))in SearchProvider.php line 188
at SearchProvider->runQuery(object(Context), object(ProductSearchQuery))in ProductListingFrontController.php line 311
at ProductListingFrontControllerCore->getProductSearchVariables()in ProductListingFrontController.php line 545
at ProductListingFrontControllerCore->doProductSearch('catalog/listing/category', array('entity' => 'category', 'id' => 205))in CategoryController.php line 137
at CategoryControllerCore->initContent()in Controller.php line 281
at ControllerCore->run()in Dispatcher.php line 511
at DispatcherCore->dispatch()in index.php line 28