diff --git a/init.lua b/init.lua
index ef1c1a1..ec4831c 100644
--- a/init.lua
+++ b/init.lua
@@ -173,7 +173,8 @@ local get_ambience = function(player)
 	end
 
 	-- wading through water
-	if minetest.registered_nodes[nod_feet].groups.water then
+	if minetest.registered_nodes[nod_feet]
+	and minetest.registered_nodes[nod_feet].groups.water then
 
 		local control = player:get_player_control()
 
diff --git a/textures/trans.png b/textures/trans.png
new file mode 100644
index 0000000..4d7beb8
Binary files /dev/null and b/textures/trans.png differ