--- gtktooltips.c	2007-09-10 18:07:09.000000000 +0200
+++ gtktooltips.c	2007-09-10 18:08:01.000000000 +0200
@@ -235,6 +235,7 @@ gtk_tooltips_set_tip (GtkTooltips *toolt
     }
   
   if (tooltips->active_tips_data 
+      && tooltipsdata
       && tooltips->active_tips_data->widget == widget
       && GTK_WIDGET_DRAWABLE (tooltips->active_tips_data->widget))
     {
