diff --git a/src/Symfony/Component/ErrorHandler/Internal/TentativeTypes.php b/src/Symfony/Component/ErrorHandler/Internal/TentativeTypes.php
index 5707a8355bc9..ee403b3d1b07 100644
--- a/src/Symfony/Component/ErrorHandler/Internal/TentativeTypes.php
+++ b/src/Symfony/Component/ErrorHandler/Internal/TentativeTypes.php
@@ -1102,6 +1102,8 @@ class TentativeTypes
             'isDot' => 'bool',
             'rewind' => 'void',
             'valid' => 'bool',
+            'key' => 'mixed',
+            'current' => 'mixed',
             'next' => 'void',
             'seek' => 'void',
         ],