diff --git a/include/error.php b/include/error.php
index b9ad7d3..aa433f7 100644
--- a/include/error.php
+++ b/include/error.php
@@ -27,7 +27,7 @@ function adminlog($msg, $section, $action, $level=E_USER_NOTICE, $email=false)
 
 	$sql = 'INSERT INTO admin_log (contributor, section, action, level, message) VALUES (?, ?, ?, ?, ?)';
 	$stmt = $dbConnection->prepare($sql);
-	$stmt->bindValue(1, is_numeric($currentuser->id) ? $currentuser->id : 'NULL');
+	$stmt->bindValue(1, is_numeric($currentuser->id) ? $currentuser->id : NULL);
 	$stmt->bindValue(2, $section);
 	$stmt->bindValue(3, $action);
 	$stmt->bindValue(4, $level);