From 0355c8fc3e6384259345d0584b845525a9b8de21 Mon Sep 17 00:00:00 2001
From: Newbie <linhdqtg@gmail.com>
Date: Fri, 19 Jan 2018 21:43:34 +0700
Subject: [PATCH] TypeError: Cannot read property 'height' of undefined

I think the Interval could be called too soon and there isn't activeBlockTemplate yet. If I'm not right, you can cancel this PR.
https://github.com/Snipa22/nodejs-pool/issues/269
https://github.com/Snipa22/nodejs-pool/issues/150
---
 lib/pool.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/pool.js b/lib/pool.js
index c61c911..96e8d6f 100644
--- a/lib/pool.js
+++ b/lib/pool.js
@@ -830,7 +830,9 @@ if (cluster.isMaster) {
     registerPool();
     setInterval(function () {
         global.mysql.query("UPDATE pools SET last_checkin = ?, active = ? WHERE id = ?", [global.support.formatDate(Date.now()), true, global.config.pool_id]);
-        global.mysql.query("UPDATE pools SET blockIDTime = now(), blockID = ? where id = ?", [activeBlockTemplate.height, global.config.pool_id]);
+        if (activeBlockTemplate) {
+            global.mysql.query("UPDATE pools SET blockIDTime = now(), blockID = ? where id = ?", [activeBlockTemplate.height, global.config.pool_id]);
+        }   
         global.config.ports.forEach(function (portData) {
             global.mysql.query("UPDATE ports SET lastSeen = now(), miners = ? WHERE pool_id = ? AND network_port = ?", [minerCount[portData.port], global.config.pool_id, portData.port]);
         });