diff --git a/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php b/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
index b1e6b3bf06b5c..6b0c8f5c65062 100644
--- a/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
+++ b/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
@@ -233,7 +233,7 @@ private function castableToString(array $choices, array &$cache = array())
}
continue;
- } elseif (!is_scalar($choice)) {
+ } elseif (!is_scalar($choice) || false === $choice) {
return false;
} elseif (isset($cache[(string) $choice])) {
return false;
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