From eeca37be0ffa6a0eee5fbc4b0a257cfc47da7667 Mon Sep 17 00:00:00 2001
From: SmallJoker <mk939@ymail.com>
Date: Fri, 22 Jan 2021 16:40:30 +0100
Subject: [PATCH] Fix error when closing a /craft formspec

Since 5.4.0-dev, hud_change() expects a valid HUD identifier. Nil results in an error.
Additionally data.hud_flags were 'nil' after closing the /craft-opened formspec
---
 init.lua | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/init.lua b/init.lua
index 13f32b7..6981938 100644
--- a/init.lua
+++ b/init.lua
@@ -1984,12 +1984,17 @@ on_receive_fields(function(player, formname, _f)
 	local sb_rcp, sb_usg = _f.scrbar_rcp, _f.scrbar_usg
 
 	if _f.quit then
-		player:hud_change(data.vignette, "text", "")
-		data.vignette = nil
+		-- Neither the vignette nor hud_flags are available when /craft is used
+		if data.vignette then
+			player:hud_change(data.vignette, "text", "")
+			data.vignette = nil
+		end
 
-		data.hud_flags.crosshair = true
-		player:hud_set_flags(data.hud_flags)
-		data.hud_flags = nil
+		if data.hud_flags then
+			data.hud_flags.crosshair = true
+			player:hud_set_flags(data.hud_flags)
+			data.hud_flags = nil
+		end
 
 		return false