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local entity = player.opened and (player.opened.grid == event.grid) and player.opened or nil

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on_player_placed_equipment (ID 38)
LuaEquipmentGrid doesn't contain key grid.

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opened :: LuaEntity or LuaItemStack or LuaEquipment or LuaEquipmentGrid or LuaPlayer or LuaGuiElement or defines.gui_type [Read-Write]
The GUI target the player currently has open; nil if none.

Note: Write supports any of the types. Read will return the entity, equipment, element or nil.

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...

-- Return the gui type name from the identifier number
local function getGUITypeName(given_id)
	for name, id in pairs(defines.gui_type) do
		if given_id == id then 
			return name
		end 
	end
end

-- Called when a player open a gui
local function saveLastOpenInformations(event)
	inizializeGlobalLastOpenDictionary()
	if not global.player_last_open_entity[event.player_index] then
		global.player_last_open_entity[event.player_index] = {nil, nil}
	end
	
	local gui_type_name = getGUITypeName(event.gui_type)
	
	if gui_type_name == "controller" and game.players[event.player_index] and game.players[event.player_index].character then
		global.player_last_open_entity[event.player_index] = game.players[event.player_index].character
	elseif gui_type_name == "entity" and event.entity then
		global.player_last_open_entity[event.player_index] = event.entity
	end
end

...

-- Called when player install a new equip in a grid
local function onInstallingEquip(event)	
	local equipment = event.equipment or false
	if equipment.valid and equipment.name == TRIGGER_EQUIP_NAME then
		local grid = event.grid
		if haveOneTriggerEquip(grid) then
			local last_open_entity = global.player_last_open_entity[event.player_index]
			local player = game.players[event.player_index]
			if last_open_entity and last_open_entity.valid then
				addMonitoredGrid(grid, last_open_entity)
				game.print(last_open_entity.name)
			end
		else
			
		end
	end
end

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	local gui_type_name = getGUITypeName(event.gui_type)
	if gui_type_name == "controller" and game.players[event.player_index] and 
	

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if event.gui_type == defines.gui_type.controller ...

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if (last_open_entity.grid == event.grid) then