Help on cannon that shoots players only

Help and Feedback Scripting Support
#1

I want to make a cannon that shoots players that sits on it but when i added

if script.Parent.Occupant ~= nil then

it then didnt work when i left the seat and then came back to sit on the cannon

local Debounce = false
local debris = game:GetService("Debris")

script.Parent.Touched:Connect(function(Ball)
	if Debounce ~= true then 
		if Ball.Parent:FindFirstChild("HumanoidRootPart") then
			Debounce = true
			local bodyv = Instance.new("BodyVelocity")
			wait(3)
			if script.Parent.Occupant ~= nil then
			Ball.Parent.Humanoid.Sit = false
			Ball.Parent.Humanoid.Jump = true
			smokeclone.Parent = script.Parent
			bodyv.Parent = Ball.Parent.HumanoidRootPart
			Ball.Parent.HumanoidRootPart.BodyVelocity.Velocity = script.Parent.CFrame.LookVector * 100
			debris:AddItem(bodyv, 5)
			wait(1)
			Debounce = false
			end
		end
		end
end)