--- ../asterisk-13.13.0_mod/main/srv.c	2016-11-23 16:26:01.000000000 +0100
+++ main/srv.c	2017-02-07 13:34:43.000000000 +0100
@@ -222,6 +222,14 @@
 		}
 
 		(*context)->prev = AST_LIST_FIRST(&(*context)->entries);
+
+		if ((*context)->num_records==0) {
+			ast_log(LOG_ERROR,"no records in srv_lookup context\n");
+			ast_free(*context);
+			*context = NULL;
+			return -1;
+		}
+
 		*host = (*context)->prev->host;
 		*port = (*context)->prev->port;
 		AST_LIST_TRAVERSE(&(*context)->entries, cur, list) {