[SPOILER] [Poisonous] Blackbox Error at the End

[Zaffre]

Hi. I just played Poisonous (great story!) but I'm having a problem with the ending portion. When I rescue Rachel from the drowning water, she tells me to get out because there are monsters patrolling the hallways. As soon as she finishes talking and a memento is written down, I get the infamous blackbox error. I've provided my hpl.log in the attachments.

I'm almost certain my drivers are up to date, and I can play any other custom stories with no problem. I've also beaten the game with no problem. Can I have some help with this? Thanks in advance.