diff --git a/src/FromWidgetPostMessageApi.js b/src/FromWidgetPostMessageApi.js
index 4dd3ea6e6d..61c51d4a20 100644
--- a/src/FromWidgetPostMessageApi.js
+++ b/src/FromWidgetPostMessageApi.js
@@ -116,10 +116,8 @@ export default class FromWidgetPostMessageApi {
         const origin = u.protocol + '//' + u.host;
         if (this.widgetMessagingEndpoints && this.widgetMessagingEndpoints.length > 0) {
             const length = this.widgetMessagingEndpoints.length;
-            this.widgetMessagingEndpoints = this.widgetMessagingEndpoints.
-                filter(function(endpoint) {
-                return (endpoint.widgetId != widgetId || endpoint.endpointUrl != origin);
-            });
+            this.widgetMessagingEndpoints = this.widgetMessagingEndpoints
+                .filter((endpoint) => endpoint.widgetId !== widgetId || endpoint.endpointUrl !== origin);
             return (length > this.widgetMessagingEndpoints.length);
         }
         return false;
diff --git a/src/components/views/elements/AppTile.js b/src/components/views/elements/AppTile.js
index 708eb39bd3..959cee7ace 100644
--- a/src/components/views/elements/AppTile.js
+++ b/src/components/views/elements/AppTile.js
@@ -339,9 +339,7 @@ export default class AppTile extends React.Component {
         // Destroy the old widget messaging before starting it back up again. Some widgets
         // have startup routines that run when they are loaded, so we just need to reinitialize
         // the messaging for them.
-        if (ActiveWidgetStore.getWidgetMessaging(this.props.id)) {
-            ActiveWidgetStore.delWidgetMessaging(this.props.id);
-        }
+        ActiveWidgetStore.delWidgetMessaging(this.props.id);
         this._setupWidgetMessaging();
 
         ActiveWidgetStore.setRoomId(this.props.id, this.props.room.roomId);
diff --git a/src/stores/ActiveWidgetStore.js b/src/stores/ActiveWidgetStore.js
index 1211195203..2d80a763d0 100644
--- a/src/stores/ActiveWidgetStore.js
+++ b/src/stores/ActiveWidgetStore.js
@@ -116,6 +116,8 @@ class ActiveWidgetStore extends EventEmitter {
     }
 
     setWidgetMessaging(widgetId, wm) {
+        // Stop any existing widget messaging first
+        this.delWidgetMessaging(widgetId);
         this._widgetMessagingByWidgetId[widgetId] = wm;
         this.emit('update');
     }