diff -Nur mutter-3.32.2.orig/src/backends/meta-egl.c mutter-3.23.2/src/backends/meta-egl.c
--- mutter-3.32.2.orig/src/backends/meta-egl.c	2016-11-22 08:27:46.000000000 -0700
+++ mutter-3.23.2/src/backends/meta-egl.c	2016-11-24 11:14:48.612133544 -0700
@@ -141,7 +141,7 @@
 
   error_str = get_egl_error_str ();
   g_set_error (error, G_IO_ERROR,
-               G_IO_ERROR_FAILED,
+               G_IO_ERROR_FAILED, "%s",
                error_str);
 }