Index: metacity-2.28.1/src/include/common.h
===================================================================
--- metacity-2.28.1.orig/src/include/common.h
+++ metacity-2.28.1/src/include/common.h
@@ -52,6 +52,7 @@ typedef enum
 
 typedef enum
 {
+  META_MENU_OP_NONE        = 0,
   META_MENU_OP_DELETE      = 1 << 0,
   META_MENU_OP_MINIMIZE    = 1 << 1,
   META_MENU_OP_UNMAXIMIZE  = 1 << 2,
Index: metacity-2.28.1/src/core/core.c
===================================================================
--- metacity-2.28.1.orig/src/core/core.c
+++ metacity-2.28.1/src/core/core.c
@@ -519,6 +519,9 @@ meta_core_get_menu_accelerator (MetaMenu
   
   switch (menu_op)
     {
+    case META_MENU_OP_NONE:
+      name = "none";
+      break;
     case META_MENU_OP_DELETE:
       name = "close";
       break;
