Changes

     for i = 1, ship:slots_length() or 0 do

     for i = 1, ship:slots_length() or 0 do

         local equipment, size = ship:slot(i)

         local equipment, size = ship:slot(i)

         if self:_is_main_gun(equipment) or self:_is_secondary_gun(equipment) then

         if equipment then

            return 1

            if self:_is_main_gun(equipment) or self:_is_secondary_gun(equipment) then

        elseif self:_is_torpedo(equipment) then

                return 1

            return 2

            elseif self:_is_torpedo(equipment) then

                return 2

         end

         end

     end

     end