diff --git a/library/think/exception/PDOException.php b/library/think/exception/PDOException.php
index abe94d70..677092b9 100644
--- a/library/think/exception/PDOException.php
+++ b/library/think/exception/PDOException.php
@@ -32,7 +32,7 @@ class PDOException extends DbException
 
         $this->setData('PDO Error Info', [
             'SQLSTATE'             => $error[0],
-            'Driver Error Code'    => $error[1],
+            'Driver Error Code'    => isset($error[1]) ? $error[1] : 0,
             'Driver Error Message' => isset($error[2]) ? $error[2] : '',
         ]);