From 36d94c88ac9ad82e987995a565a86dc770e440d0 Mon Sep 17 00:00:00 2001
From: Ian Barwick <ian@2ndquadrant.com>
Date: Tue, 27 Jan 2015 16:28:17 +0900
Subject: [PATCH] Handle empty result set

Should never happen, but just in case.`
---
 dbutils.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/dbutils.c b/dbutils.c
index 515ade7c..f8f48df4 100644
--- a/dbutils.c
+++ b/dbutils.c
@@ -448,6 +448,13 @@ get_upstream_connection(PGconn *standby_conn, char *cluster, int node_id,
 		return NULL;
 	}
 
+	if(!PQntuples(res))
+	{
+		log_notice(_("No upstream server record found"));
+		PQclear(res);
+		return NULL;
+	}
+
 	strncpy(upstream_conninfo, PQgetvalue(res, 0, 0), MAXCONNINFO);
 
 	if(upstream_node_id_ptr != NULL)