From dc6e30b4a385582d38c4d67a5c9ecf9a35b63ebf Mon Sep 17 00:00:00 2001
From: Phil Booth <pmbooth@gmail.com>
Date: Fri, 20 Apr 2018 07:53:21 +0100
Subject: [PATCH] fix(server): fix undefined dereference

https://github.com/mozilla/fxa-content-server/pull/6086
r=shane-tomlinson
---
 server/lib/user-agent.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/lib/user-agent.js b/server/lib/user-agent.js
index fe8aeee46a..4f10da24c9 100644
--- a/server/lib/user-agent.js
+++ b/server/lib/user-agent.js
@@ -34,7 +34,7 @@ function safeFamily (parent) {
 }
 
 function safeVersion (parent) {
-  if (! VALID_VERSION.test(parent.toVersionString())) {
+  if (parent && parent.toVersionString && ! VALID_VERSION.test(parent.toVersionString())) {
     parent.major = parent.minor = parent.patch = parent.patchMinor = null;
   }
 }