--- src/bin/sh/eval.c.orig	2008-09-04 19:34:53.000000000 +0200
+++ src/bin/sh/eval.c	2009-03-22 22:20:17.000000000 +0100
@@ -166,7 +166,8 @@
 	setstackmark(&smark);
 	setinputstring(s, 1);
 	while ((n = parsecmd(0)) != NEOF) {
-		evaltree(n, 0);
+		if (n != NULL)
+			evaltree(n, 0);
 		popstackmark(&smark);
 	}
 	popfile();