A Force Quit seems to be the only next thing to do.
I'm playing ToME: Tales of Maj'Eyal v1.5.5 on an Apple iMac desktop computer running OS X Yosemite Version 10.10.5
Here is the error log file:
error = "Lua Error: /mod/class/Game.lua
At [C]:-1 __index\
At /mod/class/Game.lua:1285 getPlayer\
At /engine/Savefile.lua:784 md5Check\
At /engine/Savefile.lua:546 loadGame\
At /engine/Module.lua:1049 instanciate\
At /engine/utils.lua:2243 showMainMenu\
At /engine/init.lua:172 \
At [C]:-1 dofile\
At /loader/init.lua:217 "
seen = true
reported = false
Hoping the savefile can be rescued...?