diff --git a/admin-dev/functions.php b/admin-dev/functions.php
index 9a9dae11a..9a06203cd 100644
--- a/admin-dev/functions.php
+++ b/admin-dev/functions.php
@@ -162,7 +162,8 @@ function getPath($urlBase, $id_category, $path = '', $highlight = '', $categoryT
 			$nCategories = (int)sizeof($categories);
 			foreach ($categories AS $category)
 			{
-				$edit = '<a href="'.$urlBase.'&id_category='.(int)$category['id_category'].'&'.(($category['id_category'] == 1 || $home) ? 'viewcategory' : 'updatecategory').'&token='.Tools::getAdminToken('AdminCategories'.(int)(Tab::getIdFromClassName('AdminCategories')).(int)$context->employee->id).'" title="'.($category['id_category'] == 1 ? 'Home' : 'Modify').'"><img src="../img/admin/'.(($category['id_category'] == 1  || $home) ? 'home' : 'edit').'.gif" alt="" /></a> ';
+				$link = Context::getContext()->link->getAdminLink('AdminCategories');
+				$edit = '<a href="'.$link.'&id_category='.(int)$category['id_category'].'&'.(($category['id_category'] == 1 || $home) ? 'viewcategory' : 'updatecategory').'" title="'.($category['id_category'] == 1 ? 'Home' : 'Modify').'"><img src="../img/admin/'.(($category['id_category'] == 1  || $home) ? 'home' : 'edit').'.gif" alt="" /></a> ';
 				$fullPath .= $edit.
 				($n < $nCategories ? '<a href="'.$urlBase.'&id_category='.(int)$category['id_category'].'&viewcategory&token='.Tools::getAdminToken('AdminCategories'.(int)(Tab::getIdFromClassName('AdminCategories')).(int)$context->employee->id).'" title="'.htmlentities($category['name'], ENT_NOQUOTES, 'UTF-8').'">' : '').
 				(!empty($highlight) ? str_ireplace($highlight, '<span class="highlight">'.htmlentities($highlight, ENT_NOQUOTES, 'UTF-8').'</span>', $category['name']) : $category['name']).
diff --git a/controllers/admin/AdminGroupsController.php b/controllers/admin/AdminGroupsController.php
index 44c806d39..f5e651656 100644
--- a/controllers/admin/AdminGroupsController.php
+++ b/controllers/admin/AdminGroupsController.php
@@ -437,6 +437,18 @@ class AdminGroupsControllerCore extends AdminController
 				}
 			}
 		}
+		else
+		{
+			// if we have no category reduction anymore, we delete the existing ones
+			Db::getInstance()->execute('
+				DELETE FROM `'._DB_PREFIX_.'group_reduction`
+				WHERE `id_group` = '.(int)Tools::getValue('id_group')
+			);
+			Db::getInstance()->execute('
+				DELETE FROM `'._DB_PREFIX_.'product_group_reduction_cache`
+				WHERE `id_group` = '.(int)Tools::getValue('id_group')
+			);
+		}
 	}
 
 	/**