diff --git a/mods/bg_api/leveled_node.lua b/mods/bg_api/leveled_node.lua
index 83cb8ec..c8f092d 100644
--- a/mods/bg_api/leveled_node.lua
+++ b/mods/bg_api/leveled_node.lua
@@ -1,7 +1,7 @@
 local function is_same_kind (pos, kindname)
 	local node = minetest.get_node(pos)
 	local node_kindname = minetest.registered_items[node.name].kindname
-	return kindname == node_kindname
+	return kindname and node_kindname and kindname == node_kindname
 end
 
 function blockgame.check_for_stacking (pos)