Guard against invalid chat messages with no user object

webroot/js/components/chat/chat-message-view.js

@@ -45,6 +45,12 @@ export default class ChatMessageView extends Component {
   render() {
     const { message, isModerator, accessToken } = this.props;
     const { user, timestamp } = message;
+
+    // User is required for this component to render.
+    if (!user) {
+      return null;
+    }
+
     const { displayName, displayColor, createdAt } = user;
     const isAuthorModerator = checkIsModerator(message);