diff --git a/src/Symfony/Bridge/Twig/Extension/YamlExtension.php b/src/Symfony/Bridge/Twig/Extension/YamlExtension.php
index 7d330c4b8985e..8ebca50d564f1 100644
--- a/src/Symfony/Bridge/Twig/Extension/YamlExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/YamlExtension.php
@@ -39,7 +39,8 @@ public function encode($input, $inline = 0, $dumpObjects = false)
$dumper = new YamlDumper();
}
- if (defined('Symfony\Component\Yaml\Yaml::DUMP_OBJECT')) {
+ if (defined('Symfony\Component\Yaml\Yaml::DUMP_OBJECT') && is_bool($dumpObjects)) {
+ @trigger_error('Passing a boolean flag to toggle object support is deprecated since version 3.1 and will be removed in 4.0. Use the Yaml::DUMP_OBJECT flag instead.', E_USER_DEPRECATED);
$dumpObjects = (int) $dumpObjects;
}
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