diff --git a/nssm_api.lua b/nssm_api.lua
index f5e898d..a6d124a 100644
--- a/nssm_api.lua
+++ b/nssm_api.lua
@@ -380,11 +380,13 @@ function nssm:midas_ability(		--ability to transform every blocks it touches in
 
 				local p = {x = pos.x + dx, y = pos.y + dy, z = pos.z + dz}
 				local n = minetest.get_node(p).name
+				local d = minetest.registered_nodes[n]
 
-				if minetest.get_item_group(n, "unbreakable") == 1
-				or minetest.is_protected(p, "") or n == "air"
-				or (n == "bones:bones" and not nssm:affectbones(self))
-				or n == m_block then
+				if d.drawtype ~= "normal" or n == m_block
+				or minetest.get_item_group(n, "unbreakable") == 1
+				or minetest.is_protected(p, "")
+				or (n == "bones:bones" and not nssm:affectbones(self)) then
+					-- do nothing
 				else
 					minetest.set_node(p, {name = m_block})
 				end