// fix products

controllers/admin/AdminProductsController.php

@@ -2414,6 +2414,7 @@ class AdminProductsControllerCore extends AdminController
 				if ($this->tabAccess['add'] && $this->display != 'add')
 					$this->page_header_toolbar_btn['duplicate'] = array(
 						'short' => 'Duplicate',
+						'href' => '#',
 						'desc' => $this->l('Duplicate'),
 						'confirm' => 1,
 						'js' => 'if (confirm(\''.$this->l('Also copy images').' ?\')) document.location = \''.$this->context->link->getAdminLink('AdminProducts').'&id_product='.(int)$product->id.'&duplicateproduct\'; else document.location = \''.$this->context->link->getAdminLink('AdminProducts').'&id_product='.(int)$product->id.'&duplicateproduct&noimage=1\';'