jquery – Uncaught SyntaxError: Unexpected end of JSON input when using Office 365 mail account

submitHandler: function submitHandler(c) {
    $.ajax({
        type: "POST",
        url: "php/bookademoform",
        data: $("#bookademoform").serialize(),
        beforeSend: function(){  
            $('#submitBtn').hide();   
            $('.loader_white').show();
        },
        success: function (resultData) {
            var data = JSON.parse(resultData);
            if (data.error == false) {
            window.location.href="https://stackoverflow.com/questions/73265772/thankyou";            
            $('.loader_white').hide();
            $("#bidhom_bookademoform").trigger("reset");
            } else {
            console.log(resultData);
            }
        },
        error: function (errorData) {
            console.log(errorData);
        }
        });

        //c.submit();

    }
});

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