diff --git a/source/libads/ldap.c b/source/libads/ldap.c
index 9eae2d4..8c37bfb 100644
--- a/source/libads/ldap.c
+++ b/source/libads/ldap.c
@@ -118,6 +118,10 @@ static int ldap_search_with_timeout(LDAP *ld,
 	if (gotalarm != 0)
 		return LDAP_TIMELIMIT_EXCEEDED;
 
+	if (*res == NULL) {
+		return LDAP_TIMELIMIT_EXCEEDED;
+	}
+
 	return result;
 }