diff -up nfs-utils-1.3.0/utils/gssd/krb5_util.c.orig nfs-utils-1.3.0/utils/gssd/krb5_util.c

--- nfs-utils-1.3.0/utils/gssd/krb5_util.c.orig	2017-03-31 16:34:11.775037704 -0400

+++ nfs-utils-1.3.0/utils/gssd/krb5_util.c	2017-04-08 15:18:53.619038636 -0400

@@ -848,7 +848,7 @@ find_keytab_entry(krb5_context context,

 	i = 0;

 	realm = realmnames[i];

-	if (strcmp (realm, preferred_realm) != 0) {

+	if (preferred_realm && strcmp (realm, preferred_realm) != 0) {

 		realm = preferred_realm;

 		/* resetting the realmnames index */

 		i = -1;