diff -up gtk+-2.12.0/gtk/gtktooltips.c.swt-tooltips gtk+-2.12.0/gtk/gtktooltips.c
--- gtk+-2.12.0/gtk/gtktooltips.c.swt-tooltips	2007-09-20 15:47:54.000000000 -0400
+++ gtk+-2.12.0/gtk/gtktooltips.c	2007-09-20 15:48:22.000000000 -0400
@@ -229,7 +229,8 @@ gtk_tooltips_set_tip (GtkTooltips *toolt
       return;
     }
   
-  if (tooltips->active_tips_data 
+  if (tooltipsdata
+      && tooltips->active_tips_data 
       && tooltips->active_tips_data->widget == widget
       && GTK_WIDGET_DRAWABLE (tooltips->active_tips_data->widget))
     {