Same thing happening to me.
I log in, and click "Sharing Center" (I see 2 new items).
I get this error:
ERROR: Something went wrong. If the problem persists, reach out to the LastPass team (Error: Invalid JSON response).
I reload the page, and it happens the same way.
Chrome, Version 88.0.4324.182 (Official Build) (x86_64)
If you are getting this error message "Error: Invalid JSON response", please follow the steps in this support article.