From 52856194073d167d09d44e4f54d4867dfb1fbb84 Mon Sep 17 00:00:00 2001
From: Lars Mueller <appgurulars@gmx.de>
Date: Sun, 24 Oct 2021 11:20:21 +0200
Subject: [PATCH] Fix crash when bit library is unavailable

---
 minetest/png.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/minetest/png.lua b/minetest/png.lua
index 49c3474..0be32fa 100644
--- a/minetest/png.lua
+++ b/minetest/png.lua
@@ -3,7 +3,7 @@ local signature = "\137\80\78\71\13\10\26\10"
 local assert, char, ipairs, insert, concat, abs, floor = assert, string.char, ipairs, table.insert, table.concat, math.abs, math.floor
 
 -- TODO move to modlib.bit eventually
-local bit_xor = bit.xor or function(a, b)
+local bit_xor = bit and bit.xor or function(a, b)
 	local res = 0
 	local bit = 1
 	for _ = 1, 32 do