From 89e1b8891d76a8647b8902a203c5196dc2b1b059 Mon Sep 17 00:00:00 2001
From: capitalthree <alexbobp@gmail.com>
Date: Mon, 20 Nov 2023 05:13:18 -0600
Subject: [PATCH] avoid crash on searching invalid nodes

---
 rules.lua | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/rules.lua b/rules.lua
index 61c1381..30a517d 100644
--- a/rules.lua
+++ b/rules.lua
@@ -37,16 +37,18 @@ function check_position(pos)
     end
 
     local ret = _check_position_uncached(pos)
-    print(ret) -- todo: remove this
     cache[hash] = ret
     return ret
 end
 
 function _check_position_uncached(pos)
     local node = minetest.get_node(pos)
-
     local reg_item = minetest.registered_items[node.name]
 
+    if not reg_item then
+        return "W"
+    end
+
     if reg_item.groups and reg_item.groups.go_stone then
         return "S" .. reg_item.go_team
     end