diff --git a/Source/API/script/ExceptionHandle/PDOError.php b/Source/API/script/ExceptionHandle/PDOError.php
index 25c0f3c..eeead77 100644
--- a/Source/API/script/ExceptionHandle/PDOError.php
+++ b/Source/API/script/ExceptionHandle/PDOError.php
@@ -10,7 +10,7 @@ class PDOError extends HttpSpecializedException {
 
     protected string $title = "PDO connection failed";
 
-    public function __construct(ServerRequestInterface $request,string $message,Throwable $previous)
+    public function __construct(ServerRequestInterface $request,string $message,?Throwable $previous = null)
     {
         $this->file = $previous->getFile();
         $this->line = $previous->getLine();