From 3dd241d28a714550d7a3bfd96356984596a676d5 Mon Sep 17 00:00:00 2001
From: Joachim Stolberg <joe.stolberg@gmx.de>
Date: Thu, 6 Dec 2018 21:59:26 +0100
Subject: [PATCH] bugfix

---
 internal1.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal1.lua b/internal1.lua
index 4fc3a2b..b4f3f75 100644
--- a/internal1.lua
+++ b/internal1.lua
@@ -166,7 +166,7 @@ end
 function Tube:update_secondary_node(fpos,fdir, npos,ndir)
 	-- [s]<-[n]----[f]->[s]
 	local fpos2, node = self:get_node(fpos, fdir)
-	if minetest.registered_nodes[node.name] and 
+	if self.secondary_node_names[node.name] and 
 			minetest.registered_nodes[node.name].tubelib2_on_update then
 		local npos2 = self:get_pos(npos, ndir)
 		if vector.equals(npos2, fpos2) then  -- last tube removed?