TypeError: null is not an object (evaluating 't._observer.release')

[taidaid]

Description

I am seeing an issue in my Sentry logs from @egjs/axes/dist/axes.esm. The error is reported as null is not an object (evaluating 't._observer.release').

My app is using "@egjs/vue-flicking": "4.7.3",

./node_modules/@egjs/axes/dist/axes.esm.js in apply at line 2759:13

          _this._detachWindowEvent(activeEvent);
          activeEvent.onRelease();
 -->     _this._observer.release(_this, prevEvent, [0, 0]);
        };
        this.element = $(el);
        this.options = __assign({
          inputType: ["touch", "mouse", "pointer"],

Steps to check or reproduce

I don't have reproduction steps sadly, but it does seem to be limited to iOS 14 and 15. I've seen Facebook, Google, and Mobile Safari apps listed.

It seems to occur when a user moves from a page which has a vue-flicking instance to a page without.

[malangfox]

Hello @taidaid.

This seems to be a bug that occurred as the major version of Axes changed from Flicking version 4.7.0.
We will try to reproduce this error and then fix it. And after the error is fixed, We will leave a comment.
If you are not using the nested option, you can temporarily resolve this problem by using version 4.6.2.

Thanks for reporting the issue.

[malangfox]

The recently released version of Flicking 4.9.1 has been changed to use the latest version of Axes, and the error you have left may has been resolved.
Try using Flicking version 4.9.1 and if the problem persists, please contact us.