From 0ba8c6bf960754b904fbe13d5c7ffcb91ac7b015 Mon Sep 17 00:00:00 2001
From: Ben Page <ben.page@openreign.com>
Date: Mon, 24 Nov 2014 14:04:25 -0600
Subject: [PATCH] missed a check is drain callback exists

---
 lib/connection-pool.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/connection-pool.js b/lib/connection-pool.js
index c2d96f1..fb7b133 100644
--- a/lib/connection-pool.js
+++ b/lib/connection-pool.js
@@ -254,7 +254,8 @@ ConnectionPool.prototype.release = function(connection) {
 ConnectionPool.prototype.drain = function (callback) {
     this.log('draining pool');
     if (this.drained) {//pool has been drained
-        callback();
+        if (callback)
+            callback();
         return;
     }