the reason is its expecting specific data in the cvar and i think it is only crashing you (the client who executes it) so no worries.
cvar example: set forcepowers "7-1-333000000330003330"
correct me if im wrong but the 7 is max force rank ( jedi master )
and the 1 is force side and here 1 is light and 2 is dark.
then the rest is all the force values, dont try and do anything cute and set them all to 3 cuz im pretty sure that wont work.