How can I reform my damage function?

Hi, I'm Goodbye_Fx.

What would be the error-free way of modifying the damage script on line 20-22?

16:10:23.137 - Humanoid is not a valid member of Workspace 16:10:23.138 - Stack Begin 16:10:23.139 - Script 'Workspace.BluePlasma Event', Line 21 16:10:23.139 - Stack End

game.Workspace.BluePlasma.OnServerEvent:Connect(function(Player, animation, Debounce)
	local AlreadyTouched = false
	local Character = Player.Character or Player.CharacterAdded:wait()
	Debounce = true
	local BluePlasma = Instance.new("Part")
	BluePlasma.Name = "BluePlasma"
	BluePlasma.Shape = Enum.PartType.Ball
	wait(0.5)
	BluePlasma.Size = Vector3.new(2,2,2)
	BluePlasma.Material = Enum.Material.Neon
	BluePlasma.BrickColor = BrickColor.Blue()
	BluePlasma.CanCollide =  false
	BluePlasma.Parent = Character
	BluePlasma.CFrame = Character.HumanoidRootPart.CFrame*CFrame.new(0,1,-6)
	local bv = Instance.new("BodyVelocity")
	bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
	bv.Velocity = Character.HumanoidRootPart.CFrame.lookVector*70
	bv.Parent = BluePlasma
	
	BluePlasma.Touched:Connect(function(Hit)
		if Hit and Hit.Parent.Humanoid then
			Hit.Parent.Humanoid:TakeDamage(5)
		end
	end)
	wait(1)
	BluePlasma:Destroy()
	Debounce = false
end)

You had some mistakes in your script, heres your fixed script:

game.Workspace.BluePlasma.OnServerEvent:Connect(function(Player, animation, Debounce)
    local AlreadyTouched = false
    local Character = Player.Character or Player.CharacterAdded:wait()
    Debounce = true
    local BluePlasma = Instance.new("Part")
    BluePlasma.Name = "BluePlasma"
    BluePlasma.Shape = Enum.PartType.Ball
    wait(0.5)
    BluePlasma.Size = Vector3.new(2,2,2)
    BluePlasma.Material = Enum.Material.Neon
    BluePlasma.BrickColor = BrickColor.Blue()
    BluePlasma.CanCollide =  false
    BluePlasma.Parent = Character
    BluePlasma.CFrame = Character.HumanoidRootPart.CFrame*CFrame.new(0,1,-6)
    local bv = Instance.new("BodyVelocity")
    bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
    bv.Velocity = Character.HumanoidRootPart.CFrame.lookVector*70
    bv.Parent = BluePlasma

    BluePlasma.Touched:Connect(function(Hit)
        if Hit.Parent:FindFirstChild("Humanoid") then
            Hit.Parent.Humanoid:TakeDamage(5)
        end
    end)
    wait(1)
    BluePlasma:Destroy()
    Debounce = false
end)

The main issues was the code block:

BluePlasma.Touched:Connect(function(Hit)
    >    if Hit and Hit.Parent.Humanoid then
            Hit.Parent.Humanoid:TakeDamage(5)
        end
    end)

in the second sentence Marked with a ">" in the line of code, your saying if Hit.Parent.Humanoid is not nil, but the thing is Your asking referencing something that isnt there when the plasma touches a non-humanoid object.