state.history[0].passage is null -- Help?

So I made a stupid mistake of editing my story made in Twine 1.3.5 in the 1.4 version without saving a copy first. I've used a lot of scripts from Glorious Trainwrecks and I think some of them are in conflict with the new "back" option, because I get this message at the beginning of the story:

state.history[0].passage is null

The story runs without problems afterwards, but I'd like to fix the problem. I've googled for it, but cannot find an answer. Could anybody please help me fix it? I'd be very grateful.

I'm attaching the html of the story. If anything else would be required, please let me know.


acg9.html107.45 KB