Last update broke player

With the last update the player stopped showing on website. The guttenberg blog displays an error in the edit page.

When I go to the “All players” section it shows no players. When I try to add a new one, and fill in all the fields, after clicking “save” it doesn’t create nothing. The “All players” list remain empty.

Please, help! I’ve lost the radio player on my website. How can I roll back to the previous plugin version? Thanks.

The page I need help with: [log in to see the link]