diff --git a/pass/app.js b/pass/app.js
index a09a9c36c3ac1d0510997aa565b91166a67320aa..f268cb19e713013edb0497f50b59d23dbac8b90a 100644
--- a/pass/app.js
+++ b/pass/app.js
@@ -60,6 +60,8 @@ app.use(function (err, req, res, next) {
   res.locals.message = err.message;
   res.locals.error = err;
 
+  console.error(err.stack);
+
   // render the error page
   res.status(err.status || 500);
   res.render("error");