clearInterval on a destroyed interval raises an exception

[alexi2014]

The following piece of code raises "TypeError: Cannot read property 'length' of null" exception in Zone._updateTaskCount:

        this._interval1 = setInterval(() => {
            // clear interval for the first time
            clearInterval(this._interval1);
        }, 100);
        setTimeout(() => {
            // a bit later clear the destroyed interval - exception
            clearInterval(this._interval1);
        }, 200);

Here's a repro plunker - check console log after you open it:
https://plnkr.co/edit/S0haHUHmxrZHmRql2EjY?p=preview

As I understand, duplicate call to clearInterval on the same interval should not raise an exception (and doesn't do it with standard implementation in browsers).

[JiaLiPassion]

@alexi2014, this has been fixed by this PR #642, please wait for the next release.

[alexi2014]

Nice, thanks!
Could you advise me to what zone.js version I need to downgrade my app to get rid of this exception (it seems to be a recently introduced regression)?

[JiaLiPassion]

@alexi2014, you can downgrade to 0.7.6, the error will disappear.

[alexi2014]

@JiaLiPassion - indeed, thank you so much!

[naveedahmed1]

@mhevery should your recent commit eb9250d also fix this issue?

[JiaLiPassion]

@naveedahmed1 , yes , it also fix this one.

[naveedahmed1]

So this issue can also be marked as closed. Can you please also share when should we expect next release with this fix?

[JiaLiPassion]

@naveedahmed1 , yes, this can be closed, sorry I don't know when it will be released, but I think it will be released soon.

[mhevery]

I am hoping to cut a release this week.