What steps will reproduce the problem?

1. Summon a controllable Death Knight Ghoul Pet
2. Set TellMeWhen to track the Cooldown of a Pet's spell ("Gnaw" in my example)
3. Let the pet die or dismiss it.
4. TellMeWhen gets confused because the spell is no longer available in the spellbook to track.

What is the expected output? What do you see instead?

I would expect TellMeWhen to temporarily stop tracking the pet's spell cooldowns when no pet is existant. Instead I received the error message below and the spell cooldown "button" stopped working completely until the next /console reloadui.

What version of the product are you using?

TellMeWhen 1.1

Do you have an error log of what happened?

TellMeWhen.lua:413 attempt to compare number with nil

Please provide any additional information below.

I assume this happens with any pet spell that has a cooldown to track.