My costum story keeps crashing after some time?

[Melaara]

After the aamfp patch, a new bug has been appearing, it happens instantly when you bring brute to the map.

No BRUTE could be found..
Did you give it another name maybe?

Like I said, a few hours ago I changed all brutes to grunts (also in the script..have I overlooked some?) because I thought it would save the problem. Before that I had two brutes in the game. One that was always active, so it was not in the script, and another one at the end, where it should spawn with a trigger.