Changes

initials[ship_index] = new_initials[ship_index]

initials[ship_index] = new_initials[ship_index]

else

else

    if new_initials[ship_index] == nil then

    if initials[ship_index] == nil then

        error(table.concat(ships, ", "))

        error(table.concat(ships, ", "))

    end

    end