Swiper: Bugsnag: o.targetTouches is undefined

[clifford-lc]

This is a (multiple allowed):

• [x] bug
• [ ] enhancement
• [ ] feature-discussion (RFC)

• Swiper Version: 4.0.7
• Vue Awesome Swiper Version: 3.1.3
• Platform/Target and Browser Versions: Chrome Mobile Android 7.0, iOS Safari iOS 12.1
• Live Link or JSFiddle/Codepen or website with issue: https://www.optusperks.com.au

What you did

We using the Vue Awesome Swiper package in our Vue project.

Expected Behavior

No bugsnag errors.

Actual Behavior

We are getting consistent bug snags errors o.targetTouches is undefined which point to a line in the swiper library:
node_modules/swiper/dist/js/swiper.js:2623
touches.currentX = e.type === 'touchstart' ? e.targetTouches[0].pageX : e.pageX;

The best outcome here is that it's a type error which can be fixed to help suppress future warnings caused by the package.

[pdbreen]

Seeing same issue with direct use of Swiper v3.4.2 - TypeError · e.targetTouches is undefined:

ams.noSwipingClass))f.allowClick=!0;else if(!f.params.swipeHandler||N(e,f.params.swipeHandler)){var n=f.touches.currentX="touchstart"===e.type?e.targetTouches[0].pageX:e.pageX,i=f.touches.currentY="to

[versedi]

Firefox 62.0 for Android is also affected by this. Device: generic tablet.

[reegodev]

https://developer.mozilla.org/en-US/docs/Web/API/TouchEvent/targetTouches#Browser_compatibility

Apparently targetTouches property is not supported on Safari.

Edit: Cannot reproduce the bug with browserStack, but all instances of this error reported with Bugsnag come from Safari 13.0.1

[spacebeers]

Having a similar issue with ios 13+.

undefined is not an object (evaluating 'targetTouches[0].pageX')

[nolimits4web]

Would be great to see JSFiddle with the issue using core swiper.js (not some 3rd party Vue or React wrapper)

[spacebeers]

Would be great to see JSFiddle with the issue using core swiper.js (not some 3rd party Vue or React wrapper)

https://codepen.io/SpaceBeers/full/GRRgRME

I _think_ the issue is caused from starting swiping from outside swiper but I'm not 100% on this yet.

[tom-sherman]

@versedi I have fixed the issue for iOS in #3259 but I wasn't able to replicate the issue because I don't have access to Firefox 62 or an Android tablet.