Ignore span.click() inside td.click()

I currently have a function acting on a td.click() as follows:

$('#tsTable').on('click', 'table tbody tr td:nth-child(2)', function(e) {

// other code here

});

I also have a span inside this td which has its own click function:

$('#tsTable').on('click', 'span.tag', function(e) {

// other code here

});

How do I stop the td.click function from triggering when I click the span.tag which is inside the td?  I only want the td.click function to trigger if the td is clicked outside the span.tag.

Hope this makes sense.