diff --git a/avRegistration/auth-method-service.js b/avRegistration/auth-method-service.js
index cbf106f3..21924fd8 100644
--- a/avRegistration/auth-method-service.js
+++ b/avRegistration/auth-method-service.js
@@ -107,7 +107,9 @@ angular.module('avRegistration')
           var tokens = [];
           if (credentialsStr) {
             var credentials = JSON.parse(credentialsStr);
-            tokens = credentials.map(function (credential) { return credential.token; });
+            tokens = credentials
+              .map(function (credential) { return credential.token; })
+              .filter(function (token) { return !!token;});
             return tokens;
           }
           if (isAdmin && $http.defaults.headers.common.Authorization) {
diff --git a/dist/appCommon-vmaster.js b/dist/appCommon-vmaster.js
index ba3dd8ca..acdb5aac 100644
--- a/dist/appCommon-vmaster.js
+++ b/dist/appCommon-vmaster.js
@@ -10,6 +10,8 @@ angular.module("avRegistration").config(function() {}), angular.module("avRegist
             var credentialsStr = $window.sessionStorage.getItem("vote_permission_tokens"), tokens = [];
             return credentialsStr ? JSON.parse(credentialsStr).map(function(credential) {
                 return credential.token;
+            }).filter(function(token) {
+                return !!token;
             }) : (isAdmin && $http.defaults.headers.common.Authorization && tokens.push($http.defaults.headers.common.Authorization), 
             tokens);
         }(halfLifes);