Diablo 1 HD Hellfire Mod | Awake

Hi, I have necromancer level 45 and I am trying to kill diablo on hell difficulty. When I try to summon skeleton the game crashes sometimes. Now I cant kill diablo
Sometimes game crashes after summon 10 skeletons, sometimes after 5, sometimes after 3-4 minutes of fight. I am trying skeletons+guardians tactic to kill diablo. Mostly the game crashes when diablo starts to create red portals.
I've checked it on two diffrent computers - with winXp and with win7.

Please help.

use skill " bone spirit" with staff got reduce magic resistan , and create skeleton and moster die in map

there´s a bug in the engine, if too many effects are played the same time the game may freeze/crash.
it does happen for me mostly when i try apocalypse spell on many units or champions (due their lightning enchantment).
since diablo casts that spell, that might be possible.
(of course can be something else too)
hope they will fix that soon.