Workspace.Land.Model.Detector.Script:6: attempt to index local 'Thirst' (a nil value)?

any explanation?

local clickdetect = script.Parent:WaitForChild("ClickDetector")

clickdetect.MouseClick:Connect(function(plr)
	print(plr)
	local Thirst = plr:FindFirstChild("ThirstVal")
	if Thirst.Value >100 then
		Thirst.Value = 100
	end
	Thirst.Value = 100
end)

##Problem

Workspace.Land.Model.Detector.Script:6: attempt to index local 'Thirst' (a nil value)?

##Whats wrong This means that Thirst is nil. You can't index something that is nil since that makes no sense.

###Example code

local a = nil

print(a.b)

This will output an error attempt to index local 'a' (a nil value) since a is nil and not a table or a userdata or has no metatable with a __index set.

##Solution Think about what your code is doing. You're looking for something called ThirstVal specifically inside plr. Perhaps you have it in a specific folder, or its inside their Character. To index a player's character use the .Character property. (plr.Character)

To prevent this error for now you can check if Thirst even exists in the first place using an if statement.

local clickDetect = ...

local function clicked(player)
	print(player)

	local thirst = player:FindFirstChild("ThirstVal")

	if thirst then --// make sure it actually exists
		--// logic checks for 
	else --// warn it doesn't exist and print the reference point to your player. 
		warn("no thirst value inside of: " ..  player:GetFullName())
	end
end

clickDetect.MouseClick:Connect(clicked)

Though again, I do suggest making sure you check where the ThirstVal is actually being added. Perhaps try indexing the player's character and looking for it.