Life Tap Buff messing up Life Tap on low mana

[Elmegaard 0]

I have created a Fight Class for my Demonology Warlock and it works great. Now I have a problem though. Since my Life Tap now gives me a buff called Life Tap, it will not cast Life Tap on low mana when that buff is active. I cannot find a way to disable the check for if the buff is already active.

I tried setting "Is Buff" to false, but no luck. I also tried making a second spell and set it to only cast when the buff is on, but that does not work either.