diff -r 7850bc57cbdc dwm.c
--- a/dwm.c	Wed May 28 10:45:18 2008 +0100
+++ b/dwm.c	Thu May 29 16:00:40 2008 +0200
@@ -1719,7 +1719,7 @@ zoom(const void *arg) {
 zoom(const void *arg) {
 	Client *c = sel;
 
-	if(!lt->arrange || sel->isfloating)
+	if(!sel || !lt->arrange || ismax || sel->isfloating)
 		return;
 	if(c == nexttiled(clients))
 		if(!c || !(c = nexttiled(c->next)))