Description:
------------
After call `json_encode()` that fails, all future `json_encode()` calls with `JSON_PRETTY_PRINT` generates output with incorrect indentation. 

See https://3v4l.org/reS06

Related: https://bugs.php.net/bug.php?id=66025

Test script:
---------------
<?php

echo json_encode([json_encode([1], JSON_PRETTY_PRINT)]), "\n";

$fp = fopen('php://stdin', 'r');
$data = ['a' => $fp];
echo json_encode($data), "\n";

echo json_encode([json_encode([1], JSON_PRETTY_PRINT)]), "\n";


Expected result:
----------------
["[\n    1\n]"]

["[\n    1\n]"]


Actual result:
--------------
["[\n    1\n]"]

["[\n        1\n    ]"]