From ac4eb746fe9da775a8bffe825a868581c0353169 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lars=20M=C3=BCller?=
 <34514239+appgurueu@users.noreply.github.com>
Date: Thu, 14 Jul 2022 20:50:21 +0200
Subject: [PATCH] Deserialization: Restore backwards compat (#12519)

---
 builtin/common/serialize.lua | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/builtin/common/serialize.lua b/builtin/common/serialize.lua
index 6278e2739..caf989e69 100644
--- a/builtin/common/serialize.lua
+++ b/builtin/common/serialize.lua
@@ -188,6 +188,16 @@ local function dummy_func() end
 local nan = (0/0)^1 -- +nan
 
 function core.deserialize(str, safe)
+	-- Backwards compatibility
+	if str == nil then
+		core.log("deprecated", "minetest.deserialize called with nil (expected string).")
+		return nil, "Invalid type: Expected a string, got nil"
+	end
+	local t = type(str)
+	if t ~= "string" then
+		error(("minetest.deserialize called with %s (expected string)."):format(t))
+	end
+
 	local func, err = loadstring(str)
 	if not func then return nil, err end