diff --git a/static/index.html b/static/index.html
index 9a34c5c..068ab04 100644
--- a/static/index.html
+++ b/static/index.html
@@ -270,6 +270,10 @@ function ensureTrailingEmpty() {
 async function init() {
     try {
         var res = await fetch("/hm-ems-report/api/files");
+        if (res.status === 401) {
+            window.location.href = "/login";
+            return;
+        }
         var files = await res.json();
 
         var sel = document.getElementById("fileSelector");
@@ -294,6 +298,10 @@ async function loadCampaign(filename) {
     showLoading(true);
     try {
         var res = await fetch("/hm-ems-report/api/load/" + encodeURIComponent(filename));
+        if (res.status === 401) {
+            window.location.href = "/login";
+            return;
+        }
         var payload = await res.json();
 
         RAW_DATA = payload.data;