this crash happens only in these situations:

deliver a quest to a goblin or take quest from a goblin
when i take quest from a goblin and then talk to another NPC

im using last version of Voice over and the Vanilla Sounds for WOTLK 3.3.5

I had the same issue. The crash was happening on specific goblins, when using the addon together with HD character models. Works, when hiding NPC portraits.