mod.conf

README.md

@@ -1,5 +1,5 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
-# Minetest Game mod: XPFW
+# Minetest Game mod: XPFW (eXPerience FrameWork)
 
 See license.txt for license information.
 
@@ -13,6 +13,10 @@ https://gitlab.com/ademant/minetest_xpfw.git
 
 https://github.com/ademant/minetest_xpfw.git
 
+Works only with Minetest >= 5.0
+
+Minetest <= 0.4.17 does not support the mechanism for handling player related meta data.
+
 ## Short description
 XPFW provide an API for storing values relevant for experience mechanism into player metadata (Identified with prefix "XPFW_"). It also stores several statistic values during playtime:
 - Walked distances calculated out of velocity (important: teleporting does not influence this value)

api.lua

@@ -60,6 +60,7 @@ xpfw.player_add_attribute=function(player,attrib,val)
 -- if <val> = nil then set to max value
 	local nval=val
 	local att_def=xpfw.attributes[attrib]
+	if att_def == nil then return end
 	if val==nil then
 		nval=att_def.max or 20
 	end
@@ -77,7 +78,8 @@ xpfw.player_sub_attribute=function(player,attrib,val)
 -- if <val> = nil then set to max value
 	local nval=val
 	local playername=player:get_player_name()
-	local att_def=M.player[playername].attributes[attrib]
+	local att_def=xpfw.attributes[attrib]
+	if att_def == nil then return end
 	if val==nil then
 		nval=att_def.max or 20
 	end

mod.conf

@@ -1,7 +1,7 @@
 name = xpfw 
 title = xpfw
 author = ademant
-description = Experience mod for Minetest
+description = eXPerience FrameWork for Minetest
 depends = default,basic_functions
 optional_depends = cmi
 license = MIT