--- glib-2.32.3/glib/gutf8.c.orig	2012-06-26 12:39:59.683569356 +0000
+++ glib-2.32.3/glib/gutf8.c	2012-06-26 13:02:47.792748286 +0000
@@ -1625,6 +1625,9 @@
 {
   const gchar *p;
 
+  if (str == NULL)
+    return FALSE;
+
   if (max_len < 0)
     p = fast_validate (str);
   else