From 7a5e39f078c304b10073e7eefbc430d36153f966 Mon Sep 17 00:00:00 2001
From: slice <ryaneft@gmail.com>
Date: Mon, 16 Jul 2018 18:05:50 -0700
Subject: [PATCH] don't subscribe to channels if fetching stats fail

---
 priv/frontend/src/components/App.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/priv/frontend/src/components/App.js b/priv/frontend/src/components/App.js
index 6f5dffa..e6aeb02 100644
--- a/priv/frontend/src/components/App.js
+++ b/priv/frontend/src/components/App.js
@@ -25,7 +25,14 @@ export default class App extends Component {
   }
 
   subscribeToChannels () {
+    if (this.state.metrics == null) {
+      // fetching state failed, bail
+      log('not going to subscribe to realtime updates due to fetch failure')
+      return
+    }
+
     const { graph } = this.state.metrics
+
     const channels = Object.keys(graph).reduce(
       (channels, name) => [...channels, `latency:${name}`, `status:${name}`],
       []