Invalid Jetpack option name PHP warning

Hello, good afternoon!

I have a problem with plugin probably – Jetpack. I have some error like that: Warning: “Invalid Jetpack option name”. The thing is when I even try to disconnect the plugin and try to connect again, there is no possibility, because I can not even click anything. Each buttons don’t work. Are you able to help me?

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