From 2917d1124a68dae66d5acfbdb9505cd11c548551 Mon Sep 17 00:00:00 2001
From: protonate <ncozi@appnexus.com>
Date: Thu, 4 May 2017 13:59:08 -0700
Subject: [PATCH] check array length when mapping sizes

---
 src/sizeMapping.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/sizeMapping.js b/src/sizeMapping.js
index 46cca5cb668..90ce5b68851 100644
--- a/src/sizeMapping.js
+++ b/src/sizeMapping.js
@@ -14,7 +14,7 @@ function mapSizes(adUnit) {
     const mapping = adUnit.sizeMapping.reduce((prev, curr) => {
       return prev.minWidth < curr.minWidth ? curr : prev;
     });
-    if(mapping.sizes) {
+    if(mapping.sizes && mapping.sizes.length) {
       return mapping.sizes;
     }
     return adUnit.sizes;
@@ -23,7 +23,7 @@ function mapSizes(adUnit) {
   const mapping = adUnit.sizeMapping.find(sizeMapping =>{
     return width > sizeMapping.minWidth;
   });
-  if(mapping && mapping.sizes){
+  if(mapping && mapping.sizes && mapping.sizes.length){
     sizes = mapping.sizes;
     utils.logMessage(`AdUnit : ${adUnit.code} resized based on device width to : ${sizes}`);
   }