Index: branches/RC/core/units/general/helpers/permissions_helper.php
===================================================================
diff -u -N -r11319 -r11538
--- branches/RC/core/units/general/helpers/permissions_helper.php	(.../permissions_helper.php)	(revision 11319)
+++ branches/RC/core/units/general/helpers/permissions_helper.php	(.../permissions_helper.php)	(revision 11538)
@@ -299,7 +299,7 @@
 			$perm_event = getArrayValue($params, 'perm_event');
 			$permission_groups = getArrayValue($params, 'permissions');
 
-			if ($permission_groups) {
+			if ($permission_groups && !$perm_event) {
 				// check permissions by permission names in current category
 				$permission_groups = explode('|', $permission_groups);
 				$group_has_permission = false;
@@ -329,7 +329,7 @@
 			}
 			elseif ($perm_event) {
 				// check permission by event name
-				list($prefix, $event) = explode(':', $perm_event);
+				list ($prefix, $event) = explode(':', $perm_event);
 				$event_handler =& $this->Application->recallObject($prefix.'_EventHandler');
 				return $event_handler->CheckPermission( new kEvent($perm_event) );
 			}
@@ -503,6 +503,10 @@
 							FROM '.$this->Application->getUnitOption('c', 'TableName').'
 							WHERE CategoryId = '.$cat_id;
 					$cat_hierarchy = $this->Conn->GetOne($sql);
+					if ($cat_hierarchy === false) {
+						// category was deleted, but refrence to it stays in other tables -> data integrity is broken
+						$cat_hierarchy = '|' . $this->Application->findModule('Name', 'Proj-CMS', 'RootCat') . '|';
+					}
 				}
 
 				$cat_hierarchy = explode('|', substr($cat_hierarchy, 1, -1));