diff --git a/Dockerfile b/Dockerfile
index 37b125a..ffe01a2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,6 +10,7 @@ COPY . .
 
 RUN npm run build
 RUN ls -lah /app/.output/public
+RUN test -f /app/.output/public/index.html
 
 # Gunakan NGINX untuk menyajikan SPA
 FROM nginx:1.29.0-alpine-slim