[javascript] Uncaught TypeError: Cannot read property 'value' of null

div class="calculate" id="calculate">
            <div class="button" id="button" onclick="myCode(this.body)"> CALCULATE ! </div>
        </div>

function myCode()
{
    var bill = document.getElementById("currency").value ;

    var people_count = document.getElementById("number1").value;
    var select_value = document.getElementById("select").value;

    var calculate = document.getElementById("calculate");

    calculate.addEventListener("click" ,function()
    {
        console.log(bill);
        console.log(people_count);
        console.log(select_value);
    });
}

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