diff --git a/src/AppStore.ts b/src/AppStore.ts
index 3f2e81ca5de..5682f5679f9 100644
--- a/src/AppStore.ts
+++ b/src/AppStore.ts
@@ -24,7 +24,11 @@ export class AppStore {
 
             if (error.status && /400|500|5\d\d|403/.test(error.status)) {
                 sendSentryMessage('ERROR DIALOG SHOWN:' + error);
-                this.siteErrors.push(new SiteError(new Error(error)));
+                if (error instanceof Error) {
+                    this.siteErrors.push(new SiteError(error));
+                } else {
+                    this.siteErrors.push(new SiteError(new Error(error)));
+                }
             }
         });
     }