diff --git a/README.txt b/README.txt
new file mode 100644
index 0000000..687b4f5
--- /dev/null
+++ b/README.txt
@@ -0,0 +1,43 @@
+Minetest mod "Pyramids"
+=======================
+version: 0.4.2 Beta
+
+License of source code and textures: WTFPL
+------------------------------------------
+(c) Copyright BlockMen (2013 - 2015)
+
+
+License of mesh model: WTFPL
+----------------------------
+(c) Copyright Pavel_S (2013)
+
+
+License of textures
+-------------------
+-pyramids_eye.png by bas080, CC-BY-SA 3.0
+-pyramids_men.png by bas080, CC-BY-SA 3.0
+-pyramids_sun.png by bas080, CC-BY-SA 3.0
+
+all other: BlockMen, WTFPL
+
+
+Licenses of sounds
+------------------
+The authors are : (freesound.org)
+-mummy.1.ogg by Raventhornn, CC0
+-mummy.2.ogg by Raventhornn, CC0
+-mummy_hurt.1.ogg by Under7dude, CC0
+-mummy_death.1.ogg by Michel88, CC-Sampling Plus 1.0
+
+This program is free software. It comes without any warranty, to
+the extent permitted by applicable law. You can redistribute it
+and/or modify it under the terms of the Do What The Fuck You Want
+To Public License, Version 2, as published by Sam Hocevar. See
+http://sam.zoy.org/wtfpl/COPYING for more details.
+
+
+Using the mod:
+--------------
+
+This mod adds randomly spawned pyramids in deserts. The pyramids are very rare and contain a chest with stuff.
+Also there are mummys inside, which attack the player if found in their radius.
diff --git a/mummy.lua b/mummy.lua
index e5c3809..f78d3f1 100644
--- a/mummy.lua
+++ b/mummy.lua
@@ -61,7 +61,7 @@ local function hit(self)
 	}
 	self.object:set_properties(prop)
 	minetest.after(0.4, function()
-		prop = {textures = mummy_texture,}
+               local prop = {textures = mummy_texture,}
 		self.object:set_properties(prop)
 	end)
 end
diff --git a/nodes.lua b/nodes.lua
index 10a059d..9d278d7 100644
--- a/nodes.lua
+++ b/nodes.lua
@@ -24,9 +24,11 @@ local trap_on_timer = function (pos, elapsed)
 	for i, obj in pairs(objs) do
 		if obj:is_player() then
 			local n = minetest.get_node(pos)
-			if n and n.name and minetest.registered_nodes[n.name].crack < 2 then
-				minetest.set_node(pos, {name="tsm_pyramids:trap_2"})
-				nodeupdate(pos)
+			if n and n.name then
+				if minetest.registered_nodes[n.name].crack and minetest.registered_nodes[n.name].crack < 2 then
+					minetest.set_node(pos, {name="tsm_pyramids:trap_2"})
+					nodeupdate(pos)
+				end
 			end
 		end
 	end