Firefox error "An error has occurred using the Stylish database."

"An error has occurred using the Stylish database. Would you like to visit a web page with possible solutions?"

Browser: Firefox 60 (Nightly), but also on Firefox 58 (Stable)
OS: Win 7 Professional

I get this error today after my nightly version was updated. I don't make any actions on stylish from more than week. I already tried to reinstall firefox with stable version but still i get this error.

//sry if my english is bad

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