[Ionic v4] Navigation -> TypeError: Cannot read property 'removeEventListener' of undefined

[peterpeterparker]

Ionic Info
@ionic/angular: "4.0.0-alpha.11"

Describe the Bug
I've got two pages both containing a slider (if that's related no idea), when I navigate (goRoot) from the first one to the second one I face the following error

Uncaught TypeError: Cannot read property 'removeEventListener' of undefined
at t.disableDraggable (k2weomgc.js:5)
at t.destroy (k2weomgc.js:5)
at t.destroy (k2weomgc.js:5)
at k2weomgc.js:5
at Array.forEach ()
at k2weomgc.js:5
at Array.forEach ()
at t.push../node_modules/@ionic/core/dist/esm/es5/k2weomgc.js.h.emit (k2weomgc.js:5)
at t.destroy (k2weomgc.js:5)
at e.componentDidUnload (k2weomgc.js:5)

the first call of that stacktrace is the following:

 e.prototype.componentDidUnload=function(){this.swiper.destroy(!0,!0)}

the last one

 d.touch||!d.pointerEvents&&!d.prefixedPointerEvents?(d.touch&&(a.removeEventListener(i.start,this.scrollbar.onDragStart,r),a.removeEventListener(i.move,this.scrollbar.onDragMove,r),a.removeEventListener(i.end,this.scrollbar.onDragEnd,o)), etc.

[tntwist]

I think this is related to the slider. I have the same error when navigating away from a page with a slider.

[peterpeterparker]

the PR of @adamlacombe delivered with v4-beta1 fix the issue

thx a lot 👍

[ionitron-bot]

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