From 4a16e287d8fa1e3d61d6a1d685ebae3d632f051a Mon Sep 17 00:00:00 2001
From: Amit Agarwal <amit@labnol.org>
Date: Tue, 5 Jun 2018 16:31:53 +0530
Subject: [PATCH] Check for token !== null

If the Property Store returns a null token, this will throw an exception.
---
 src/Service.gs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Service.gs b/src/Service.gs
index bedb3fb..10a2dc2 100644
--- a/src/Service.gs
+++ b/src/Service.gs
@@ -256,7 +256,7 @@ Service_.prototype.handleCallback = function(callbackRequest) {
   var verifier = callbackRequest.parameter.oauth_verifier;
   var token = this.getToken_();
 
-  if (requestToken && requestToken != token.public) {
+  if (!token || (requestToken && requestToken != token.public)) {
     throw 'Error handling callback: token mismatch';
   }