CTD with strange notification on Tobex.

Hi,

Playing a Mega Mod (see my weidu.log), I encountered a CTD in the Planar Sphere  in "technical  room" Area0420. As my team entered this full of lizard men room, it crashed.

Tobex notify me the following error :

[Tue 07 Jan 2014 19:37:14] ASSERTION FAILED! Return Address: 0x9FFB75 File: ChVidImage3d.cpp Line: 899 Expression: FALSE Message: CVidCell::FXRender3dSetPalette: LoadFrame() failed.

I 'v tried to reload including from different save files but  with no change at all.

I don't understand what it means but I guessed that there was stg wrong with the lizard men as I remarked when entering the room, the shaman lizard begun to cast a spell (some blessing). 

So I decided to kill him with  "ctrl+y" cheat code as soon as entering the room. It works. Killing the shaman lizard prevents the crash.

So now may be there is someone to help me finding and fixing what's exactly going wrong with this monster (see Area0420.BAF attached)