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The Ruin maker Updated (Fork) mod (0.1.4) has caused a fatal error.
Please report this error to the mod author.

Error while running event ruin-maker_updated_fork::on_gui_click (ID 1)
LuaEntityPrototype doesn't contain key max_health.
stack traceback:
 [C]: in function '__index'
 __ruin-maker_updated_fork__/output.lua:54: in function 'create_entity'
 __ruin-maker_updated_fork__/output.lua:87: in function 'output_selection'
 __ruin-maker_updated_fork__/control.lua:13: in function 'confirm_selection'
 __ruin-maker_updated_fork__/control.lua:19: in function <__ruin-maker_updated_fork__/control.lua:17>

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30 local function create_entity(entities, center, damage, items, fluids, out)
31  if next(entities) == nil then return end
32
33  out[#out+1] = "  entities =\n"
34  out[#out+1] = "  {\n"
35
36  for _, entity in pairs(entities) do
37    local vec = util.vector_from_center(entity.position, center)
38
39    out[#out+1] = "    {\"" .. entity.name .. "\", "
40    out[#out+1] = "{x = " .. vec.x .. ", y = " .. vec.y .. "}, "
41
42    out[#out+1] = "{" -- extra options start
43
44    local dir = entity.direction
45    if dir ~= defines.direction.north then
46      out[#out+1] = "dir = \"" .. util.direction_to_str(dir) .. "\", "
47    end
48    if entity.is_entity_with_owner then
49      if entity.force.name ~= "player" and entity.force.name ~= "neutral" then
50        out[#out+1] = "force = \"enemy\", "
51      end
52    end
53    if damage and entity.is_entity_with_health and (entity.get_health_ratio() ~= 1) then
54      local dmg = math.floor(entity.prototype.max_health - entity.health)
55      out[#out+1] = "dmg = {dmg = " .. dmg .. "}, "
56    end
57    if items and entity.has_items_inside() then
58      local inv = nil
59      if entity.type == "container" or entity.type == "logistic-container" then
60        inv = entity.get_inventory(defines.inventory.chest)
61      elseif entity.type == "ammo-turret" then
62        inv = entity.get_inventory(defines.inventory.turret_ammo)
63      end
64      if inv then
65        out[#out+1] = "items = " .. serpent.line(inv.get_contents()) .. ", "
66      end
67    end
68    if fluids and entity.get_fluid_count() > 0 then
69      out[#out+1] = "fluids = " .. serpent.line(entity.get_fluid_contents()) .. ", "
70    end
71    if entity.type == "assembling-machine" then
72      local recipe = entity.get_recipe()
73      if recipe then
74        out[#out+1] = "recipe = \"" .. recipe.name .. "\", "
75      end
76    end
77    out[#out+1] = "}},\n" -- extra options and entity end
78  end
79
80  out[#out+1] = "  },\n"
81end

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53    if damage and entity.is_entity_with_health and (entity.get_health_ratio() ~= 1) then
54     local dmg = math.floor(entity.prototype.max_health - entity.health)
55      out[#out+1] = "dmg = {dmg = " .. dmg .. "}, "
56    end

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    if damage and entity.is_entity_with_health and (entity.get_health_ratio() ~= 1) then
      local dmg = math.floor(entity.prototype.get_max_health() - entity.health)
      out[#out+1] = "dmg = {dmg = " .. dmg .. "}, "
    end