Uncaught error multitouch gestures in iOS Safari

[aivarsak]

On multitouch gestures uncaught error is thrown.
TypeError: undefined is not an object (evaluating 'i.offset'). 30% of all uncaught errors in our app is due to coords.offset.

It seems like solution suggested by @R00GER for different problem may work as fix here #45

Thanks

[pablobirukov]

@aivarsak I can't reproduce error with multitouch on iOS 9.2.

My fix definitely helps to avoid the error but it may cause other problems. So if you will be able to reproduce issue and provide scenario it will be an argument

[pablobirukov]

Issue reproduced. Multitouch triggers series of touchstart/touchend and error occurs.
Will investigate