create error 500

Hi,

https://developer.mautic.org/?php#create-contact

after updating Mautic from 2.15.0 to 2.15.1, (mautic api 2.15 and even 2.15-beta) the create contact method respond in an error (testet with custom php unit test, was green before, and manual with postman saved request):

The response has unexpected status code (500).
Log says:

[2019-03-27 10:05:50] mautic.CRITICAL: Uncaught PHP Exception Symfony\Component\Validator\Exception\UnexpectedTypeException: "Expected argument of type "string", "array" given" at ../wwwdocs/vendor/symfony/validator/Constraints/LengthValidator.php line 38 {"exception":"[object] (Symfony\Component\Validator\Exception\UnexpectedTypeException(code: 0): Expected argument of type "string", "array" given at ../wwwdocs/vendor/symfony/validator/Constraints/LengthValidator.php:38)"} []

Reading actions retrieve contact data, whithout error. Are there any breaking changes in requesting create contact?

• Cache was cleared
• Backend is running

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Reproduce the create-contact request from https://developer.mautic.org/?php#create-contact using the custom PHPUnit test or saved Postman request, comparing Mautic 2.15.0 with 2.15.1. Start with the logged Symfony Validator LengthValidator.php failure and trace the request data that reaches it. Done means the create-contact request no longer returns HTTP 500 and the existing test passes.