From c7fe694a5d7223245269ca0f582d4ebc5a5fb693 Mon Sep 17 00:00:00 2001
From: "Manu Mtz.-Almeida" <manu.mtza@gmail.com>
Date: Thu, 8 Mar 2018 00:29:12 +0100
Subject: [PATCH] fix(router): invalid url

---
 packages/core/src/components/router/utils/dom.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/core/src/components/router/utils/dom.ts b/packages/core/src/components/router/utils/dom.ts
index 53a085f316..d124bce3c3 100644
--- a/packages/core/src/components/router/utils/dom.ts
+++ b/packages/core/src/components/router/utils/dom.ts
@@ -1,8 +1,8 @@
 import { breadthFirstSearch } from './common';
 import { NavOutlet, RouteChain } from './interfaces';
 
-export function writeNavState(root: HTMLElement, chain: RouteChain, index: number, direction: number): Promise<void> {
-  if (index >= chain.length) {
+export function writeNavState(root: HTMLElement, chain: RouteChain|null, index: number, direction: number): Promise<void> {
+  if (!chain || index >= chain.length) {
     return Promise.resolve();
   }
   const route = chain[index];