From fc3b035aac66c5636ef7d77c0659a157cdf4384d Mon Sep 17 00:00:00 2001
From: Whymarrh Whitby <whymarrh.whitby@gmail.com>
Date: Tue, 23 Jul 2019 17:14:04 -0230
Subject: [PATCH] Check balance before testing it w/ isZero (#6898)

---
 app/scripts/controllers/detect-tokens.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/scripts/controllers/detect-tokens.js b/app/scripts/controllers/detect-tokens.js
index e6940c613..f0ceab8e6 100644
--- a/app/scripts/controllers/detect-tokens.js
+++ b/app/scripts/controllers/detect-tokens.js
@@ -47,7 +47,7 @@ class DetectTokensController {
       }
       tokensToDetect.forEach((tokenAddress, index) => {
         const balance = result[index]
-        if (!balance.isZero()) {
+        if (balance && !balance.isZero()) {
           this._preferences.addToken(tokenAddress, contracts[tokenAddress].symbol, contracts[tokenAddress].decimals)
         }
       })