My game crashes whenever im about to beat 8.1.6 boss

Im using a 7*R1 Guillotine 2099 and whenever I hit scytallis who is at 7% HP into her own trap it kicks me out of the game

Comments

^ This has happened 3 times already and has costed me around 200 units

I tried again today twice and was kicked both times

Is there anyway for me to get this fixed? I cant progress