increase your script memory from 50 to 999, i assume your addon is collecting too much data/info once it gets too crowded for ya and the old client was setup so it would shutdown when exceeding the memory cap rather than implicate the pc of the customer.
You can do that within the addon settings before selecting a character to play, the number to change is located in the right upper corner and usually marked in white and indicates how much ram is permitted to be used by the in-game functions.