NaN being returned on parseInt()

http://ift.tt/17owcEW

In the example above I have 3 buttons, orange, green and red.

On hover each reveals a [ - ] and a [ + ] button with a class of btn_action.

On click I'm trying to grab the numerical value from the target color button and then increment or decrement it by 1.

Currently I'm getting NaN on my parseInt function:

$('.btn_action').unbind('click').bind('click', function() {
    var type = $(this).data('type').toString();

    console.log(color);
    console.log(type);

    // this is returning NaN, it should be returning 1:
    var number = parseInt($('option_'+color).text(), 10);
    console.log(number);

    if (type === 'plus') {
        // number = number + 1;
        $('option_'+color).text(number + 1);
        console.log(number);
    }
});

Thoughts on where I'm going wrong?