--- slock.c.orig	2012-02-11 04:51:37.000000000 -0500
+++ slock.c	2012-04-06 23:34:23.430768217 -0400
@@ -55,7 +55,7 @@
 	rval =  pw->pw_passwd;
 
 #if HAVE_SHADOW_H
-	{
+        if (1 >= strlen(rval)) {
 		struct spwd *sp;
 		sp = getspnam(getenv("USER"));
 		if(!sp)