diff --git a/README.md b/README.md
index d775d36..68b2207 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,14 @@
 
 * Version: 0.6
 
-## Using the mod
+## Description
 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.
 
+## For users of the old `pyramids` mod
+This mod is a fork of the old `pyramids` mod by BlockMen and intended to be a direct
+(but unofficial) successor of it.
 
 ## Licensing
 This program is free software. It comes without any warranty, to
diff --git a/init.lua b/init.lua
index 05d3511..fd38dfd 100644
--- a/init.lua
+++ b/init.lua
@@ -175,3 +175,17 @@ minetest.register_on_generated(function(minp, maxp, seed)
 		minetest.after(0.8,make,p2)
 	end
 end)
+
+-- Add backwards-compability for nodes from the original pyramids mod
+if minetest.get_modpath("pyramids") == nil then
+	-- Nodes
+	minetest.register_alias("pyramids:trap", "tsm_pyramids:trap")
+	minetest.register_alias("pyramids:trap_2", "tsm_pyramids:trap_2")
+	minetest.register_alias("pyramids:deco_stone1", "tsm_pyramids:deco_stone1")
+	minetest.register_alias("pyramids:deco_stone2", "tsm_pyramids:deco_stone2")
+	minetest.register_alias("pyramids:deco_stone3", "tsm_pyramids:deco_stone3")
+	minetest.register_alias("pyramids:spawner_mummy", "tsm_pyramids:spawner_mummy")
+
+	-- FIXME: Entities are currently NOT backwards-compatible
+	-- TODO: Update README when full backwards-compability is achieved
+end
diff --git a/mummy.lua b/mummy.lua
index f78d3f1..02a3f5d 100644
--- a/mummy.lua
+++ b/mummy.lua
@@ -375,7 +375,9 @@ if not minetest.setting_getbool("only_peaceful_mobs") then
 			if obj:is_player() then
 				player_near = true 
 			else
-				if obj:get_luaentity().mob_name == "mummy" then mobs = mobs + 1 end
+				if obj:get_luaentity() and obj:get_luaentity().mob_name == "mummy" then
+					mobs = mobs + 1
+				end
 			end
 		end
 		if player_near then