Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello,

I didn't find a post on that so I'm creating one.
I just got to lvl 8 on my warlock Undead, I bought my new skills for lvl 8 and I realized that everytime I clicked on a character, NPC or player, my Life Tap skill was used automatically.

I don't think it's supposed to happend so ...

Please disable all your Addons. Possible culprit: Necrosis.