Index: /home/enrico/src/xfce/xfce4-panel/trunk/plugins/clock/clock.c
===================================================================
--- /home/enrico/src/xfce/xfce4-panel/trunk/plugins/clock/clock.c	(Revision 26623)
+++ /home/enrico/src/xfce/xfce4-panel/trunk/plugins/clock/clock.c	(Arbeitskopie)
@@ -231,7 +231,8 @@
     static GtkTooltips *tooltips = NULL;
     struct tm           tm;

-    g_return_val_if_fail (clock->tooltip_format != NULL, TRUE);
+    if (G_UNLIKELY (clock->tooltip_format == NULL))
+        return TRUE;

     /* allocate the tooltip on-demand */
     if (G_UNLIKELY (tooltips == NULL))