My gun hurts the shooter?

Ok so I have this gun and I'm trying to make it so that it only kills zombies and not players, but right now when you shoot it, it hurts the shooter. Can anyone help?

local tool = script.Parent
local user

tool.Equipped:connect(function(mouse)
	user = tool.Parent
	mouse.Button1Down:connect(function()
		if script.Parent.Ammo.Value > 0 and script.Parent.shoot.Value == true then
			local ray = Ray.new(tool.Handle.CFrame.p, (mouse.Hit.p - tool.Handle.CFrame.p).unit*300)
			local hit, position = game.Workspace:FindPartOnRay(ray, user)
			
			local humanoid = hit.Parent and hit.Parent:FindFirstChild("Humanoid")
			if humanoid and hit.Parent:FindFirstChild("Follow")then
				humanoid:TakeDamage(30)
			end	
			local distance = (position - tool.Handle.CFrame.p).magnitude
			local rayPart = Instance.new("Part", user)
			rayPart.Name = "RayPart"
			rayPart.BrickColor = BrickColor.new("Dark stone grey")
			rayPart.Transparency = .5
			rayPart.Anchored = true
			rayPart.CanCollide = false
			rayPart.TopSurface = Enum.SurfaceType.Smooth
			rayPart.BottomSurface = Enum.SurfaceType.Smooth
			rayPart.FormFactor = Enum.FormFactor.Custom
			rayPart.Size = Vector3.new(.2, .2, distance)
			rayPart.CFrame = CFrame.new(position, tool.Handle.CFrame.p)*CFrame.new(0, 0, -distance/2)
			game.Debris:AddItem(rayPart, .1)
			script.Parent.Handle.FireSound:Play()
			script.Parent.Ammo.Value = script.Parent.Ammo.Value - 1
			--game.Players.LocalPlayer.PlayerGui.Main.inGame.AmmoGui.ammo.Text = script.Parent.Ammo.Value--]]
		elseif script.Parent.Ammo.Value == 0 then
			for i = 1, script.Parent.ReloadAmmo.Value do
				wait(.1)
				script.Parent.Ammo.Value = script.Parent.Ammo.Value + 1
				script.Parent.shoot.Value = false
				--game.Players.LocalPlayer.PlayerGui.Main.inGame.AmmoGui.ammo.Text = script.Parent.Ammo.Value
			end
			script.Parent.shoot.Value = true
		end
	end)
	
	--[[local on = false
	mouse.KeyDown:connect(function(key)
		if string.lower(key)== "e" then
			if on then
			on = false
			for i = 1, 9 do
				wait(0.01)
				game.Workspace.CurrentCamera.FieldOfView = game.Workspace.CurrentCamera.FieldOfView + 5
			end
			game.Players.LocalPlayer.CameraMode = Enum.CameraMode.Classic
			elseif not on then
			on = true
			for i = 1, 9 do
				wait(0.01)
				game.Workspace.CurrentCamera.FieldOfView = game.Workspace.CurrentCamera.FieldOfView - 5
			end
			game.Players.LocalPlayer.CameraMode = Enum.CameraMode.LockFirstPerson
		end
		end
	end)--]]
end)