diff --git a/src/Symfony/Component/PasswordHasher/Hasher/Pbkdf2PasswordHasher.php b/src/Symfony/Component/PasswordHasher/Hasher/Pbkdf2PasswordHasher.php
index 57fbe0728fe93..2fc762cb4e870 100644
--- a/src/Symfony/Component/PasswordHasher/Hasher/Pbkdf2PasswordHasher.php
+++ b/src/Symfony/Component/PasswordHasher/Hasher/Pbkdf2PasswordHasher.php
@@ -69,7 +69,7 @@ public function hash(string $plainPassword, string $salt = null): string
throw new LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
}
- $digest = hash_pbkdf2($this->algorithm, $plainPassword, $salt, $this->iterations, $this->length, true);
+ $digest = hash_pbkdf2($this->algorithm, $plainPassword, $salt ?? '', $this->iterations, $this->length, true);
return $this->encodeHashAsBase64 ? base64_encode($digest) : bin2hex($digest);
}
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