Same issue.
Unassign all of my troops then when going to soldier equip tab, it crashes.
At first i thought it was a mod, but did a completely new install and tested it with a clean game, and problem is still there.
Edit: Just tested it when having all of my troops still assigned, then going into the equipment tab.
Then unassigning 1 by 1. it does not crash when you have still 1 left, the moment you unassign him/her.
It crashes.