I have a multi-step form that has "Next" and "Go back" buttons in each step. But every time a "Next" or "GO back" button is clicked on  the console appears "

    Uncaught TypeError: Cannot read property 'nodeName' of undefined

        at Tab._activate (bootstrap.js:3687)

".

Do you know what can be the issue? I have a fiddle with the example but in the fiddle the buttons no navigate between the form steps are not working don't know why.

Example: https://jsfiddle.net/7r1tg863/4/