When multlple CSTimer instances exist, sessions created are not saved

[slower-cuber]

In the same browser, say I have opened CSTimer in two tabs (or two windows), and then create a new session in each of the tab, then the records in one of the sessions are not saved and will disappear after reload/close. I can reproduce this issue

This is not uncommon, especially when I have too many tabs, despite may not be intentional. Sometimes I just forget I have opened a CSTimer tab X, so I open a new one Y and create a session to do some solves. Then tomorrow I forget I have Y, but I found there's my tab X, and create another session to practice.

My gut feeling is the same incremental index number is used in both tabs when creating a new session. So one of them (the earlier one) is not saved

I have searched keywords like "session" and "multiple" but didn't find a similar issue. Excuse me if this is duplicated.

Regards