diff --git a/src/pages/_app.tsx b/src/pages/_app.tsx
index 32f6c7f..f0f240d 100644
--- a/src/pages/_app.tsx
+++ b/src/pages/_app.tsx
@@ -23,6 +23,10 @@ function MyApp({ Component, pageProps: { session, ...pageProps } }: AppProps<{ s
   const { i18n } = useTranslation();
   const settingStore = useSettingStore();
 
+  // Check whether those NEXT_PUBLIC_ envs are properly exposed in frontend.
+  // See https://github.com/vercel/next.js/discussions/17641
+  console.log("Use database:", process.env.NEXT_PUBLIC_DATABASE_LESS);
+
   useEffect(() => {
     const darkMediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
     const handleColorSchemeChange = (e: MediaQueryListEvent) => {