diff --git a/ft-app/app/templates/contract.html b/ft-app/app/templates/contract.html
index 1728810..19d92ae 100644
--- a/ft-app/app/templates/contract.html
+++ b/ft-app/app/templates/contract.html
@@ -84,7 +84,8 @@ document.querySelectorAll('.amp-cell').forEach(function(cell) {
   cell.addEventListener('click', function() {
     var row = cell.parentElement.parentElement;
     var tbl = document.getElementById('bars-table');
-    var rows = tbl.querySelectorAll('tr');
+    // Only rows with data-index (skip header + next-day row)
+    var dataRows = tbl.querySelectorAll('tr[data-index]');
     var idx = parseInt(row.dataset.index);
     if (idx < 5) return;
 
@@ -94,7 +95,7 @@ document.querySelectorAll('.amp-cell').forEach(function(cell) {
     var html = '<tr><td>日期</td><td>最高−最低</td></tr>';
     var sum = 0;
     for (var j = idx - 5; j < idx; j++) {
-      var r = rows[j + 1];
+      var r = dataRows[j];
       html += '<tr><td>' + r.dataset.date + ' ' + r.dataset.weekday + '</td><td>' + r.dataset.diff + '</td></tr>';
       sum += parseInt(r.dataset.diff);
     }