--- window.c.orig	2016-04-23 05:28:42.747333426 +0300
+++ window.c	2016-04-23 05:31:41.186766149 +0300
@@ -2984,7 +2984,8 @@
       else
         {
           const char *name = _wnck_atom_name (atoms [i]);
-          g_warning ("Unhandled action type %s", name ? name: "(nil)");
+          if ((name == NULL) || (strncmp (name, "_NET_WM_", (sizeof ("_NET_WM_") - sizeof (char)) / sizeof (char)) == 0))
+            g_warning ("Unhandled action type %s", name ? name: "(nil)");
         }
 
       i++;
