Type $ nikkifucked = True (or False, depending on the truth) in the consoleive got a lot of exception bugs;
after dinner on day 4 when going back to your room get;
"game/script04.rpy", line 18328, in script
game/script04.rpy, line 18362, in <module>
"go to nikkis room" if (nikkifucked==false) and (nightisroomseen04=fale)
Name error: name 'nikkifucked' is not defined
But your save must be incompatible for some reason, that variable is declared at the beginning of day02.