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Entity [name=oil-refinery, type=assembling-machine, position={803.5000000000, -537.5000000000}, setup=false, owned-by-ghost=false, to-be-deconstructed=false, to-be-upgraded=false, simulation=true] belongs to invalid force index=6

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game.merge_forces(force_name, 'neutral')

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 21.711 Warning Map.cpp:347: Map loading failed: Entity [name=transport-belt, type=transport-belt, position={48.5000000000, 228.5000000000}, setup=false, owned-by-ghost=false, to-be-deconstructed=false, to-be-upgraded=false, simulation=true] belongs to invalid force index=7
  22.086 Error AppManagerStates.cpp:1566: Entity [name=transport-belt, type=transport-belt, position={48.5000000000, 228.5000000000}, setup=false, owned-by-ghost=false, to-be-deconstructed=false, to-be-upgraded=false, simulation=true] belongs to invalid force index=7

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local function kill_force(force_name, cause)
    local this = ScenarioTable.get_table()
    local force = game.forces[force_name]
    local town_center = this.town_centers[force_name]
    local market = town_center.market
    local position = market.position
    local surface = market.surface
    local balance = town_center.coin_balance
    local town_name = town_center.town_name
    surface.create_entity({name = 'big-artillery-explosion', position = position})

    local is_suicide = cause and force_name == cause.force.name

    for _, player in pairs(force.players) do
        this.spawn_point[player.index] = nil
        this.cooldowns_town_placement[player.index] = game.tick + 3600 * 5
        this.buffs[player.index] = {}
        if player.character then
            player.character.die()
        else
            this.requests[player.index] = 'kill-character'
        end
        player.force = game.forces.player
        Map.disable_world_map(player)
        Public.set_player_color(player)
        Public.give_key(player.index)
    end
    for _, e in pairs(surface.find_entities_filtered({force = force_name})) do
        if e.valid then
            if destroy_military_types[e.type] == true then
                surface.create_entity({name = 'big-artillery-explosion', position = position})
                e.die()
            elseif destroy_robot_types[e.type] == true then
                surface.create_entity({name = 'explosion', position = position})
                e.die()
            elseif destroy_wall_types[e.type] == true then
                e.die()
            elseif storage_types[e.type] ~= true then -- spare chests
                local random = math_random()
                if random > 0.5 or e.health == nil then
                    e.die()
                elseif random < 0.25 then
                    e.health = e.health * math_random()
                end
            end
        end
    end
    local r = 27
    for _, e in pairs(surface.find_entities_filtered({area = {{position.x - r, position.y - r}, {position.x + r, position.y + r}}, force = 'neutral', type = 'resource'})) do
        if e.name ~= 'crude-oil' then
            e.destroy()
        end
    end

    game.merge_forces(force_name, 'neutral')
    this.town_centers[force_name] = nil
    delete_chart_tag_for_all_forces(market)

    -- reward the killer
    local message
    if is_suicide then
        message = town_name .. ' has given up'
    elseif cause == nil or not cause.valid or cause.force == nil then
        message = town_name .. ' has fallen to an unknown entity (DEBUG ID 0)!' -- TODO: remove after some testing
    elseif cause.force.name == 'player' or cause.force.name == 'rogue' then
        local items = {name = 'coin', count = balance}
        town_center.coin_balance = 0
        if balance > 0 then
            if cause.can_insert(items) then
                cause.insert(items)
            else
                local chest = surface.create_entity({name = 'steel-chest', position = position, force = 'neutral'})
                chest.insert(items)
            end
        end
        if cause.name == 'character' then
            message = town_name .. ' has fallen to ' .. cause.player.name .. '!'
        elseif cause.force.name == 'player' then
            message = town_name .. ' has fallen to outlanders!'
        elseif cause.force.name == 'rogue' then
            message = town_name .. ' has fallen to rogues!'
        else
            message = town_name .. ' has fallen to an unknown entity (DEBUG ID 1)!' -- TODO: remove after some testing
        end
    elseif cause.force.name ~= 'enemy' then
        if this.town_centers[cause.force.name] ~= nil then
            local killer_town_center = this.town_centers[cause.force.name]
            if balance > 0 then
                killer_town_center.coin_balance = killer_town_center.coin_balance + balance
                cause.force.print(balance .. ' coins have been transferred to your town')
            end
            if cause.name == 'character' then
                message = town_name .. ' has fallen to ' .. cause.player.name .. ' from ' .. killer_town_center.town_name .. '!'
            else
                message = town_name .. ' has fallen to ' .. killer_town_center.town_name .. '!'
            end
        else
            message = town_name .. ' has fallen to an unknown entity (DEBUG ID 2)!' -- TODO: remove after some testing
            log('cause.force.name=' .. cause.force.name)
        end
    else
        message = town_name .. ' has fallen to the biters!'
    end

    Server.to_discord_embed(message)
    game.print('>> ' .. message, {255, 255, 0})
end

local function on_forces_merged()
    -- Remove any ghosts that have been moved into neutral after a town is destroyed. This caused desyncs before.
    for _, e in pairs(game.surfaces.nauvis.find_entities_filtered({force = 'neutral', type = 'entity-ghost'})) do
        if e.valid then
            e.destroy()
        end
    end
end