ActorStats will automatically clone a stats table provided with an actor...

ActorStats will automatically clone a stats table provided with an actor definition to prevent multiple actors referencing the same table.  (for static definitions, like those in ToME necrotic minions)

Entity.init will automatically initialize the compute_vals table for temporary values.

game/engines/default/engine/Entity.lua

@@ -125,7 +125,7 @@ function _M:init(t, no_default)
 			error("Entity definition has a closure: "..err)
 		end
 	end
-
+	self.compute_vals = self.compute_vals or {n=0}
 	if self.color then
 		self.color_r = self.color.r
 		self.color_g = self.color.g
@@ -941,11 +941,10 @@ end
 -- @int id the id of the increase to delete
 -- @param[type=boolean] noupdate if true the actual property is not changed and needs to be changed by the caller
 function _M:removeTemporaryValue(prop, id, noupdate)
+	if not id then util.send_error_backtrace("error removing prop "..tostring(prop).." with id nil") return end
 	local oldval = self.compute_vals[id]
 --	print("removeTempVal", prop, oldval, " :=: ", id)
-	if not id then util.send_error_backtrace("error removing prop "..tostring(prop).." with id nil") return end
 	self.compute_vals[id] = nil
-
 	-- Find the base, one removed from the last prop
 	local initial_base, initial_prop
 	if type(prop) == "table" then

game/engines/default/engine/interface/ActorStats.lua

@@ -51,8 +51,8 @@ end
 
 --- Initialises stats with default values if needed
 function _M:init(t)
-	self.stats = t.stats or {}
-	self.inc_stats = t.inc_stats or {}
+	self.stats = t.stats and table.clone(t.stats) or {}
+	self.inc_stats = t.inc_stats and table.clone(t.inc_stats) or {}
 	for i, s in ipairs(_M.stats_def) do
 		if self.stats[i] then
 		elseif self.stats[s.short_name] then