This happens to me frequently when I have a random ctd, and then I boot up Morrowind again and try to load my last save. During the "initializing" stage, I get this weird message that says Expression Error Unable to find dialogue id @@@@@@@@ == 1mem in script emb_mynpcundo.. When I hit "ok" the game crashes again. After that second crash after the initial ctd, the game usually loads fine. However, I'm really curious as to what's causing this and whether there's a way to stop it.

Does anyone know what this means, or what mod it's associated with? My guess would be Companion Health Bars for MGE XE or Vampiric Embrace, although I'm not sure what makes me guess that.

Just double-checked both mods, that script is in fact part of VE. But I have no idea what's causing it. My char isn't even a vampire yet.