diff --git a/broadcast/index.frm.php b/broadcast/index.frm.php
index 3a6b53f..2f38220 100644
--- a/broadcast/index.frm.php
+++ b/broadcast/index.frm.php
@@ -3,11 +3,11 @@
     <head>
         <meta charset="UTF-8" />
         <meta name="viewport" content="width=device-width, initial-scale=1.0">
-        <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
-        <script src="https://code.jquery.com/ui/1.12.0/jquery-ui.min.js"></script>
-        <script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1/i18n/jquery.ui.datepicker-ja.min.js"></script>
-        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous" />
-        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/themes/base/jquery-ui.min.css" />
+        <script src="//code.jquery.com/jquery-3.3.1.min.js"></script>
+        <script src="//code.jquery.com/ui/1.12.0/jquery-ui.min.js"></script>
+        <script src="//ajax.googleapis.com/ajax/libs/jqueryui/1/i18n/jquery.ui.datepicker-ja.min.js"></script>
+        <link href="//cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous" />
+        <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/themes/base/jquery-ui.min.css" />
         <link href="./style.css" rel="stylesheet" />
         <title>伊地知ニジカ放送局 - ニジカ返答ログ</title>
     </head>
@@ -120,7 +120,7 @@
             <?php endif ?>
         </div>
 
-        <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL" crossorigin="anonymous"></script>
+        <script src="//cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL" crossorigin="anonymous"></script>
         <script src="./script.js" type="text/javascript"></script>
     </body>
 </html>
diff --git a/broadcast/index.php b/broadcast/index.php
index 2e69fab..7448458 100644
--- a/broadcast/index.php
+++ b/broadcast/index.php
@@ -12,8 +12,8 @@ $length = (int) ($_GET['max'] ?? 20);
 $asc = ($_GET['asc'] ?? 0) != 0;
 $keyword = trim ($_GET['q'] ?? '');
 
-$date_start = $_GET['start'] ?: null;
-$date_end = $_GET['end'] ?: null;
+$date_start = ($_GET['start'] ?? null) ?: null;
+$date_end = ($_GET['end'] ?? null) ?: null;
 
 $f = fopen (LOG_PATH, 'r');
 
