Is there any way to fix a broken savefile?

[OneMoreNameless]

Not posting this under bugs, since it was probably my own fault for trying to switch a save file between betas 24 and 23. It (mostly) worked to progress through a couple of dungeons, then broke and now fails to load. Kind of frustrating since this was my furthest character so far.

Error in the te4_log.txt is:

return d [string "d={}..."]:195: '}' expected near '#'
Lua Error: /engine/class.lua:214: bad argument #1 to 'setfenv' (number expected, got nil)

Any way to salvage?