From c8f9586c9bbb939b4c272503e9adbc71c7041ec6 Mon Sep 17 00:00:00 2001
From: Richard Lewis <richard@smetco.co.uk>
Date: Thu, 29 Mar 2018 17:35:21 +0100
Subject: [PATCH] Check for valid reference.

---
 src/components/views/rooms/Stickerpicker.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/components/views/rooms/Stickerpicker.js b/src/components/views/rooms/Stickerpicker.js
index 12917e209d..fe99a18d92 100644
--- a/src/components/views/rooms/Stickerpicker.js
+++ b/src/components/views/rooms/Stickerpicker.js
@@ -90,7 +90,9 @@ export default class Stickerpicker extends React.Component {
     }
 
     componentWillUnmount() {
-        dis.unregister(this.dispatcherRef);
+        if (this.dispatcherRef) {
+            dis.unregister(this.dispatcherRef);
+        }
     }
 
     _imError(errorMsg, e) {