--- tc.func.c.orig	2013-05-16
+++ tc.func.c		2013-05-16
@@ -733,7 +733,7 @@ auto_lock(void)
 	pp = xgetpass("Password:");
 
 	crpp = XCRYPT(pw, pp, srpp);
-	if ((strcmp(crpp, srpp) == 0)
+	if ((crpp && (strcmp(crpp, srpp) == 0))
 #ifdef AFS
 	    || (ka_UserAuthenticateGeneral(KA_USERAUTH_VERSION,
 					   afsname,     /* name */