From 4c79bd711009ba9bfefcff5a4e36f31f0279a41e Mon Sep 17 00:00:00 2001
From: luk3yx <luk3yx@users.noreply.github.com>
Date: Fri, 5 Feb 2021 14:31:28 +1300
Subject: [PATCH] Improve safety.lua again

---
 safety.lua | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/safety.lua b/safety.lua
index 75c1f79..98e423b 100644
--- a/safety.lua
+++ b/safety.lua
@@ -50,7 +50,8 @@ end
 -- Similar to ast.flatten(), however removes unsafe elements.
 local function safe_flatten(tree)
     local res = {formspec_version = 1}
-    if tree.formspec_version and tree.formspec_version > 1 then
+    if type(tree.formspec_version) == 'number' and
+            tree.formspec_version > 1 then
         res.formspec_version = 2
     end
     for elem in safe_walk(table.copy(tree)) do