diff --git a/Course.php b/Course.php
index c84ccff..c5a6cfb 100644
--- a/Course.php
+++ b/Course.php
@@ -650,8 +650,9 @@ include 'Header.php';
  function remarking(data)
  {
      const details = prompt("Please enter your remarking reasons","");
-
-     window.location.href = data+"&details="+details;
+     if (details != null) {
+	 window.location.href = data+"&details="+details;
+     }
  }
 
 
diff --git a/Header.php b/Header.php
index c197fd2..0733467 100644
--- a/Header.php
+++ b/Header.php
@@ -9,8 +9,10 @@ try {
 } catch (mysqli_sql_exception $e) {
     echo $e->getMessage();
 }
+
 // Check database connection
 if (mysqli_connect_errno()) {
+    echo " Error number: ".mysqli_connect_errno();
     exit();
 }
 ?>