diff --git a/frontend/app.tsx b/frontend/app.tsx
index f503b7ed0..13c934195 100644
--- a/frontend/app.tsx
+++ b/frontend/app.tsx
@@ -146,6 +146,7 @@ const MUST_LOAD: ResourceName[] = [
 ];
 
 export class RawApp extends React.Component<AppProps, {}> {
+  private _isMounted = false;
   private get isLoaded() {
     return (MUST_LOAD.length ===
       intersection(this.props.loaded, MUST_LOAD).length);
@@ -156,8 +157,9 @@ export class RawApp extends React.Component<AppProps, {}> {
  * access into the app, but still warned.
  */
   componentDidMount() {
+    this._isMounted = true;
     setTimeout(() => {
-      if (!this.isLoaded) {
+      if (this._isMounted && !this.isLoaded) {
         error(t(Content.APP_LOAD_TIMEOUT_MESSAGE), { title: t("Warning") });
       }
     }, LOAD_TIME_FAILURE_MS);
@@ -166,6 +168,10 @@ export class RawApp extends React.Component<AppProps, {}> {
       warning(t(Content.UNSUPPORTED_BROWSER));
   }
 
+  componentWillUnmount() {
+    this._isMounted = false;
+  }
+
   render() {
     const syncLoaded = this.isLoaded;
     const { bot, dispatch, getConfigValue } = this.props;