Permission denied to access property "type"

[JeanCarriere]

I get in production an error sometimes (firefox 50 / windows 10):
Permission denied to access property "type"

if (!evt) return;
                                if (evt.type === 'click')
                                    return clickHandler(evt);
                                else if (evt.type === 'keypress')
                                    return keypressHandler(evt);

I'm using the CDN

[benvinegar]

@JeanCarriere – anything more to go on here? Do you use iframes at all? Are you using custom DOM events?

[JeanCarriere]

Hum I do use some iframes (loading external content like google documents)
One module of my application uses custom dom events (https://github.com/serkanyersen/ifvisible.js/ )
The stack trace I get does not give more information :(

[benvinegar]

@JeanCarriere – Custom DOM events seem like a likely culprit. I'll investigate.