From 4533a311e168bad6a09f49e91a42d745043ea3aa Mon Sep 17 00:00:00 2001
From: Julian Lam <julian@nodebb.org>
Date: Tue, 1 May 2018 15:21:15 -0400
Subject: [PATCH] possible fix to req.flash err crash

---
 src/controllers/authentication.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/controllers/authentication.js b/src/controllers/authentication.js
index f9eb6f75e2..639857c768 100644
--- a/src/controllers/authentication.js
+++ b/src/controllers/authentication.js
@@ -177,9 +177,13 @@ authenticationController.registerComplete = function (req, res, next) {
 
 		async.parallel(callbacks, function (_blank, err) {
 			if (err.length) {
-				req.flash('errors', err.filter(Boolean).map(function (err) {
+				err = err.filter(Boolean).map(function (err) {
 					return err.message;
-				}));
+				});
+			}
+
+			if (err) {
+				req.flash('errors', err);
 				return res.redirect(nconf.get('relative_path') + '/register/complete');
 			}