diff --git a/packages/inertia/src/router.ts b/packages/inertia/src/router.ts
index f72f8f1cb..da608aa9d 100644
--- a/packages/inertia/src/router.ts
+++ b/packages/inertia/src/router.ts
@@ -152,7 +152,7 @@ export class Router {
   }
 
   protected isLocationVisitResponse(response: AxiosResponse): boolean {
-    return response && response.status === 409 && response.headers['x-inertia-location']
+    return !!response && response.status === 409 && response.headers['x-inertia-location']
   }
 
   protected isInertiaResponse(response: AxiosResponse): boolean {