diff -up ./plugins/sudoers/sssd.c.mailfix ./plugins/sudoers/sssd.c
--- ./plugins/sudoers/sssd.c.mailfix	2015-12-15 15:11:20.353612132 +0100
+++ ./plugins/sudoers/sssd.c	2015-12-15 15:11:46.048374417 +0100
@@ -788,7 +788,7 @@ sudo_sss_result_get(struct sudo_nss *nss
 	switch (sss_error) {
 	case 0:
 	    if (u_sss_result != NULL) {
-		if (state != NULL) {
+		if (state != NULL && u_sss_result->num_rules > 0) {
 		    sudo_debug_printf(SUDO_DEBUG_DEBUG, "state |= USERMATCH");
 		    *state |= _SUDO_SSS_STATE_USERMATCH;
 		}