Removing cargo pants on npc causes game to crash

Windows XP on ASUS Eee minilaptop

It only happens on one of my npc’s. I’m using 6. I wanted to put leather pants on him and when I take off the cargo pants the whole game crashes.
so I got this one to happen over and over. should I just post a link to my save game or email it to you?

Link would be better. Compress the save and upload it somewhere on any sensible hosting site.

Are the NPCs on a vehicle? Occupied with something? With full inventory?