'goodbye' command does not work

[Kerbx]

I think problem is here, in the last raw with 'goodbye':

['settings'] = {
            ['Welcome'] = 'off',
            ['Extra'] = 'on',
            --['Flood'] = 'off',
            ['Silent'] = 'off',
            ['Rules'] = 'off',
            ['Reports'] = 'off',
            ['Welbut'] = 'off', -- "read the rules" button under the welcome message
            ['Weldelchain'] = 'off', -- delete the previously sent welcome message when a new welcome message is sent
            ['Antibot'] = 'off',
            ['Clean_service_msg'] = 'off',
            Goodbye = 'off',
        },

Can you fix it please?