Doomsday Engine

I've experienced this bug when I was finishing the Heresiarch's Seminary hub.
The save I made just before the exit gate has turned out unloadable. When I try to load it, the game exits to the menu screen and the following text is displayed:

Load save game "? Press y or n

If I press y, the game crashes with the error:

Application terminated due to exception:
Uncaught exception during loop iteration:
[InProgressError] (GameSession::reloadMap) No game session is in progress

I attached the provided details.

If I press n, I can safely return to the main menu, hovewer any consecutive attempts to load some other save files crashes the game with a "Segmentation error".

This also applies to any further save files I make while playing the Castle of Grief hub.

That was yesterday. Today none of my saves work, all of them behave like broken. When I press y, the game crashes with a different error:

App init failed:
[InvalidIdError] (PersistentCanvasWindow::main) No window found with id "main"

I've seen this bug before while quick-saving (unfortunately with the 1.14.5 release).
I'm attaching the problematic save file.

I don't know if it's related, but dometimes when I launch Hexen, an error report appears - "savegametool.exe has stopped working". When I close it, the game loads successfully.

There seems to be a problem with attaching files in Redmine, so here are the uploads:
https://www.dropbox.com/s/4y1i96weampe1lc/hex2.save <- this doesn't work
https://www.dropbox.com/s/akpa20limb17wif/hex5.save <- this worked until today
https://www.dropbox.com/s/0550j0g6bdcrsyx/details_after_pressing_y.txt <- log