From 2019e7df18f1b912b66136f6bcccb65f86e33686 Mon Sep 17 00:00:00 2001
From: Lactozilla <jp6781615@gmail.com>
Date: Tue, 16 Jan 2024 20:17:01 -0300
Subject: [PATCH] Throw warning on invalid translations

---
 src/lua_mobjlib.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/lua_mobjlib.c b/src/lua_mobjlib.c
index 301a9cfd2c..85e4590c57 100644
--- a/src/lua_mobjlib.c
+++ b/src/lua_mobjlib.c
@@ -710,9 +710,14 @@ static int mobj_set(lua_State *L)
 	}
 	case mobj_translation:
 	{
-		int id = R_FindCustomTranslation(luaL_checkstring(L, 3));
-		if (id != -1)
-			mo->translation = id;
+		if (!lua_isnil(L, 3)) {
+			const char *tr = luaL_checkstring(L, 3);
+			int id = R_FindCustomTranslation(tr);
+			if (id != -1)
+				mo->translation = id;
+			else
+				return luaL_error(L, "invalid translation '%s'.", tr);
+		}
 		else
 			mo->translation = 0;
 		break;
-- 
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