Cannot find Humanoid even though Humanoid exists?

handle.Touched:connect(function(hit)
            if Mouse.Button1Down then
                        while true do
                            wait(0.1)
                            if hit.Parent:WaitForChild("Humanoid",1) then
                                hit.Parent:WaitForChild("Humanoid",1):TakeDamage(100)
                                print("Success!")
                            else
                                print("Something happened.")
                            end
                        end
                    end
                end)

The script keeps saying that "Humanoid" is a nil value, even though it exists in the target. What do I do to fix this?