diff --git a/lib/Slackbot_worker.js b/lib/Slackbot_worker.js
index ba8da8e0b..73989845c 100755
--- a/lib/Slackbot_worker.js
+++ b/lib/Slackbot_worker.js
@@ -625,9 +625,14 @@ module.exports = function(botkit, config) {
     };
 
     bot.dialogError = function(errors) {
-        if (typeof(errors) === 'object') {
+        if (!errors) {
+            errors = [];
+        }
+
+        if (Object.prototype.toString.call(errors) !== '[object Array]') {
             errors = [errors];
         }
+
         bot.res.json({
             errors: errors
         });