--- zsh-4.2.6/Src/Zle/complist.c	2005-04-25 12:20:00.000000000 +0200
+++ zsh-4.2.6-patched/Src/Zle/complist.c	2007-02-02 23:06:36.000000000 +0100
@@ -1845,6 +1845,9 @@
 {
     Menusearch s = msearchstack;
 
+    if (!s)
+        return NULL;
+
     if (s->prev)
         msearchstack = s->prev;