diff --git a/node_breaker.lua b/node_breaker.lua
index 03df35c..3267dc9 100644
--- a/node_breaker.lua
+++ b/node_breaker.lua
@@ -278,7 +278,7 @@ minetest.register_node("pipeworks:nodebreaker_off", {
 		minetest.get_meta(pos):set_string("owner", placer:get_player_name())
 	end,
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
-		if oldmetadata.inventory.pick then
+		if oldmetadata.inventory.pick and oldmetadata.fields.formspec then
 			local stack = oldmetadata.inventory.pick[1]
 			if not stack:is_empty() then
 				minetest.add_item(pos, stack)
@@ -378,7 +378,7 @@ minetest.register_node("pipeworks:nodebreaker_on", {
 		minetest.get_meta(pos):set_string("owner", placer:get_player_name())
 	end,
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
-		if oldmetadata.inventory.pick then
+		if oldmetadata.inventory.pick and oldmetadata.fields.formspec then
 			local stack = oldmetadata.inventory.pick[1]
 			if not stack:is_empty() then
 				minetest.add_item(pos, stack)