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  • Hi @fabian

    Please keep in mind this is a community forum, not a support desk. If you wish for one on one support, please email us here: http://support.advancedcustomfields.com/

    As for you question, the radio button is not a type of input which can allow a null value. It was a mistake for it to ever allow such behavior.

    The acf/validate_value filter can be used on any value to return a customized validation result which is performed on submission of the post and displayed via AJAX.

    Does that help?