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Do you mean that you are getting an error when saving? That might happen if you use an incognito or private tab, since those prevent the browser from saving data.

Yes, so how do I prevent this error from happening again?

There is no way to prevent the save from breaking if you are using an incognito tab.
The game should be fully playable on a phone's web browser if that is of any help (if you decide to do this, make sure to read on the game description how that works, because navigating out of some menus is not intuitive).