swiper.destroy() throwing Error with progressbar in swiper7

[Joscha95]

Check that this is really a bug

• I confirm

Reproduction link

https://codesandbox.io/s/swiper-pagination-progress-forked-6nbel?file=/index.html:2544-2604

Bug description

I think I ran into a bug, that has never occurred to me before the update:
I have a swiper with a progressbar and when I call swiper.destroy() on it I get an error in the console:

I checked it in the demo and just pasted setTimeout(() => {swiper.destroy();}, 3000); at line 100 after the swiper init.
If it has bullets it all works fine.
(note that the screenshot is from my project, not the demo, just to avoid confusion)

Expected Behavior

No response

Actual Behavior

No response

Swiper version

7.0.0

Platform/Target and Browser Versions

Safari 14.0.1
Firefox 91.0.2

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Make sure this is a Swiper issue and not a framework-specific issue

Would you like to open a PR for this bug?

• I'm willing to open a PR

[Joscha95]

thanks for the quick fix!