Got an issue when trying to filter a joined column in my new grid items, redirecting me to dashboard. This only affects the join column, I can filter with no problem the other fields. The code: public function __prepareCollection() { $ collection = Mage::getModel(‘catalog/product)->getCollection() ->addAttributeToSelect(array(name, supplier)); $ collection->joinLeft(array(‘sell’ => ‘table_sell’,’sell.product_id = e.entity_id’, array(‘grid_field’ => ‘count(caseRead more