why wont the nil work so you cant do the wallrun in air

game:GetService("RunService").Stepped:Connect(function()
    character = game.Players.LocalPlayer.Character or game.Players.LocalPlayer.CharacterAdded:Wait()
    WallRun_Detect = 2.5
     local rayLeft = Ray.new(character.HumanoidRootPart.CFrame.p, -character.HumanoidRootPart.CFrame.RightVector * WallRun_Detect)
    local rayRight = Ray.new(character.HumanoidRootPart.CFrame.p, character.HumanoidRootPart.CFrame.RightVector * WallRun_Detect)
    local right, rightPos = workspace:FindPartOnRay(rayRight, character, false, true)
    local left, leftPos = workspace:FindPartOnRay(rayLeft, character, false,true)    
    print(left) print(right)
    if character.Humanoid.FloorMaterial == Enum.Material.Air then
        if rayLeft~=nil then
            Left_Wallrun = character.Humanoid:LoadAnimation(script.LeftRunAnim)
            Left_Wallrun:Play()    
        NonGrav = Instance.new("BodyVelocity",character:WaitForChild("Torso"))    
        NonGrav.MaxForce= Vector3.new(1,10,1)    
        NonGrav.Velocity=Vector3.new(0,1,0)
        elseif rayRight~=nil then
            
        end
    else
        Left_Wallrun:Stop(0)
        wait(0.05)
        Left_Wallrun:Destroy()    
    end    
end)
--[[
this wont work
--]]
AnonymousEdited