diff -ru gal2.4-2.4.2/gal/widgets/e-canvas.c gal2.4-2.4.2.fixed/gal/widgets/e-canvas.c
--- gal2.4-2.4.2/gal/widgets/e-canvas.c	2003-06-13 17:13:05.000000000 +0200
+++ gal2.4-2.4.2.fixed/gal/widgets/e-canvas.c	2005-05-24 18:48:39.000000000 +0200
@@ -1015,7 +1015,7 @@
 
 void e_canvas_hide_tooltip  (ECanvas *canvas)
 {
-	if (canvas->tooltip_window) {
+	if (canvas && canvas->tooltip_window) {
 		gtk_widget_destroy (canvas->tooltip_window);
 		canvas->tooltip_window = NULL;
 	}
