'attempt to index nil with "WaitForChild"

i am making a game right now and i want enemies that spawn to have a health bar + player base. All i have been giving this function to has a humanoid. but it will not stop saying attempt to index nil with wait for child at line 16. (This is a module script located in replicated)

 local Players = game:GetService("Players")
 local health = {}

function health.Setup(model)
    local newHealthBar = script.HealthGui:Clone()
    newHealthBar.Adornee = model:WaitForChild("Head")
    newHealthBar.Parent = Players.LocalPlayer.PlayerGui
   health.UpdateHealth()
    model.Humanoid.HealthChanged:Connect(function()
        health:UpdateHealth(newHealthBar, model)
    end)
end

function health.UpdateHealth(gui, model)
    local humanoid = model:WaitForChild("Humanoid")

    if humanoid and gui then
        local percent = humanoid.Health / humanoid.MaxHealth
        gui.CurrentHealth.Size = UDim2.new(percent, 0, 0.5, 0)
        if humanoid.Health <= 0 then
            gui.Title.Text = model.Name .. "Has died"
        else
            gui.Title.Text = "Health:" .. humanoid.Health .. "/" .. humanoid.MaxHealth
        end
    end
end

return health
luaroblox


Solution 1:[1]

In health.Setup you call health.UpdateHealth() so in health.UpdateHealth gui and model are nil values.

That's why local humanoid = model:WaitForChild("Humanoid") is causing the observed error.

If you don't provide any arguments to a function all its parameters are nil. nil values may not be indexed as in model:WaitForChild("Humanoid") which is syntactic sugar for model["WaitForChild"](model, "Humanoid") where model["WaitForChild"] is the indexing operation.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Piglet

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