--- fvwm/ewmh_events.c.orig	2007-08-08 05:17:43.000000000 +0900
+++ fvwm/ewmh_events.c	2008-02-27 22:01:34.000000000 +0900
@@ -191,6 +191,10 @@
 	{
 		return 0;
 	}
+	if (fw == NULL)
+	{
+		return 0;
+	}
 	if (
 		ev->xclient.data.l[3] == fw->g.normal.width &&
 		ev->xclient.data.l[4] == fw->g.normal.height)