I have a similar error. When a battle starts, the screen goes black, the music starts, but then, a message pop-up, and is the following:
Script 'MOG_Enemy_Motion' line 278: NoMethodError occurred.
undefined method `[]=' for nil:NilClass
I started playing with 1.986 (the saving is from said version), and it kept crashing with both 1.987 and 1.988. This means that since 1.987 we need to make a new game?
EDIT: In a new game, i can go into battle without any problem.
Script 'MOG_Enemy_Motion' line 278: NoMethodError occurred.
undefined method `[]=' for nil:NilClass
I started playing with 1.986 (the saving is from said version), and it kept crashing with both 1.987 and 1.988. This means that since 1.987 we need to make a new game?
EDIT: In a new game, i can go into battle without any problem.