When you open up an empty Party Sheet, pressing either the roll Ability or Party Attack buttons throw errors in the console:
Script Error: [string "ps/scripts/ps_roll_ability.lua"]:22: bad argument #1 to 'pairs' (table expected, got nil)
Script Error: [string "ps/scripts/ps_roll_atk.lua"]:32: bad argument #1 to 'pairs' (table expected, got nil)
Obviously this is a stupid thing to do, but nonetheless, shouldn't see console errors unless something unexpected happens.