From 4370eedc0a4324de15916f1a7890295133aa75c3 Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Thu, 3 Sep 2026 20:28:08 +0300
Subject: [PATCH] fix rig:set_matrix for nil index

---
 src/logic/scripting/lua/libs/lib__skeleton.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/logic/scripting/lua/libs/lib__skeleton.cpp b/src/logic/scripting/lua/libs/lib__skeleton.cpp
index 2453b121f..a310abe87 100644
--- a/src/logic/scripting/lua/libs/lib__skeleton.cpp
+++ b/src/logic/scripting/lua/libs/lib__skeleton.cpp
@@ -77,6 +77,9 @@ static int l_get_matrix(lua::State* L) {
 
 static int l_set_matrix(lua::State* L) {
     if (auto skeleton = get_skeleton(L)) {
+        if (lua::isnoneornil(L, 2)) {
+            return 0;
+        }
         auto index = index_range_check(*skeleton, lua::tointeger(L, 2));
         skeleton->pose.matrices[index] = lua::tomat4(L, 3);
     }