Can't open Joomla Article with Sp Page Builder after last update

Hi there at Joomshaper,
I made the last update of Sp Page Builder 4.0.8 , and since then I cannot open Joomla article made with Sp Page builder integration. I get a warning message saying "You are not permitted to edit this page because one more person is already checked-in".
No one else than me is working on this website and no one is connected at that time.
Could you help ? thanks in anticipation.