ToME: the Tales of Maj'Eyal

My games always start in Safe Mode. I have disabled addons and shaders, and the bug remains. I found the following error in the log:

error = "Lua Error: /engine/utils.lua bad argument #1 to 'setmetatable' (table expected, got string)\
At [C]:-1 \
At [C]:-1 setmetatable\
At /engine/utils.lua:1399 tooltip\
At /mod/class/UserChatExtension.lua:53 sendKillerLink\
At /mod/class/interface/PartyDeath.lua:133 die\
At /mod/class/interface/ActorLife.lua:33 takeHit\
At /mod/class/Actor.lua:2840 basetakeHit\
At /mod/addons/necromancy+/superload/mod/class/Actor.lua:46 takeHit\
At /data/damage_types.lua:491 defaultProjector\
At /data/damage_types.lua:703 projector\
At /data/zones/arena/grids.lua:60 check\
At /engine/Map.lua:801 checkEntity\
At /mod/addons/improved-restauto/superload/mod/class/Actor.lua:123 act\
At /mod/class/Player.lua:373 act\
At /engine/GameEnergyBased.lua:129 tickLevel\
At /engine/GameEnergyBased.lua:64 tick\
At /engine/GameTurnBased.lua:51 tick\
At /mod/class/Game.lua:1386 "
seen = true
reported = false