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"TypeError: Property 'handleEvent' is not callable." in Firefox #393

@hheexx

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@hheexx

In firefox on load and on scroll I receive this error in console:

TypeError: Property 'handleEvent' is not callable.

I have debugged a little and found the reason.
util/dom.js
addStepEventListeners() lines 82, 83
https://github.com/shipshapecode/shepherd/blob/master/src/js/utils/dom.js#L82

this._onScreenChange is null. You can't register null handler.

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