WotLK My game crashes when i select a certain character

[Conaroto22]

I looked on the Errors guide and the error i have is the Error#132 but i tried to solve it and i cant, i have a level 40 warlock undead that for some reason everytime i select him on the character screen the game just crashes and the error appears but it is only with that character, theother i can do everything just fine but i cant select that one for some reason, i had that problem early but it just stopped after a while, can someone please help me solve this? i uped him to 40 in one whole day and i feel so frustated that i cant use him i cant even delete him because the game crashes! I'm using wrath of the lich king new (not the old one) is that what is causing it?

[Mitzen]

I'm using wrath of the lich king new (not the old one) is that what is causing it?

It's possible.
My Account > Services > Free > Character Unstuck. If that doesn't help, download old client.