bulletActiveClass Pagination prop breaks swiper v9.1.0 when adding multiple classes

[Armas0n]

Check that this is really a bug

• I confirm

Reproduction link

https://stackblitz.com/edit/swiper-9-1-0-activebullet-bug?file=pages/index.js

Bug description

After upgrading to version 9 and adding multiple classes to bulletActiveClass option, swiper crashed with the following error:

Unhandled Runtime Error

InvalidCharacterError: DOMTokenList.remove: The token can not contain whitespace.
Call Stack
node_modules/swiper/modules/pagination/pagination.js (133:0)

If I switch back to Swiper v8.3.2 everything works fine and there are no crashes.

Expected Behavior

Not crashing when using multiple classes

Actual Behavior

Crash when using multiple classes

Swiper version

9.1.0

Platform/Target and Browser Versions

any modern browser

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