I haven't finished the game yet, but I was trying to find a fix for this error (TypeError when viewing Karina's memory scenes). Aside from downloading an earlier version of the game, I believe I may have found a solution. I basically compared the new version of the game to an old version of the game and found the JSON file where "this.postEventProcId" is (which this function call seems to break the game). All I did was remove the JSON object encapsulating the "this.postEventProcId" function. I can't speak as to entirely the consequences of removing it. But through my testing, my Karina scenes are fixed and the game is functioning normally for me.
If other people can test it or possibly tell me if this fix has any other impacts to the game, please let me know. Regardless I suggest everyone to make a copy of their save file and the original game to make sure none of their data is lost.
Reminder, this is for version v.1.3.5 of the game. I imagine any possible future updates to this game will fix it. And if you are uncertain about below, I think you can always download older versions of the game to view the Karina scenes. Below are the steps to resolve the error like I have.
Instructions:
1) Extract the JSON file in this zip
2) Paste it into the following directory "Your Tratritle Game Directory\www\data"
3) It should ask if you want to replace the file select yes
4) Run the game normally
Once again please let me know if this solution works for you and if there's any game differences or issues you may or may not have noticed when applying the fix.