Schedule Back up - Failed: 1048, “Column ‘’website’ cannot be null”

I selected all websites and scheduled backups, but it error.
Operation Failed!
1048, “Column ‘’website’ cannot be null”

Please help me!!! thanks!

im getting same error

Instead of using check all website once checkbox if you select website one by one it will work and not give your error. I think the all select checkbox select empty site from list or add empty line as site