From f05e3712d66ac96ac8d1a5f287dae71ca4f3f17d Mon Sep 17 00:00:00 2001
From: RedworkDE <10944644+RedworkDE@users.noreply.github.com>
Date: Thu, 29 Jun 2023 16:03:22 +0200
Subject: [PATCH] C#: Synchronize adding ScriptInstances

(cherry picked from commit 8fdebb85ef180c1e31e023c6b1a51cea683270a1)
---
 modules/mono/csharp_script.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/modules/mono/csharp_script.cpp b/modules/mono/csharp_script.cpp
index a77b1d83adc..e516baedbce 100644
--- a/modules/mono/csharp_script.cpp
+++ b/modules/mono/csharp_script.cpp
@@ -1532,7 +1532,10 @@ CSharpInstance *CSharpInstance::create_for_managed_type(Object *p_owner, CSharpS
 		instance->_reference_owner_unsafe();
 	}
 
-	p_script->instances.insert(p_owner);
+	{
+		MutexLock lock(CSharpLanguage::get_singleton()->get_script_instances_mutex());
+		p_script->instances.insert(p_owner);
+	}
 
 	return instance;
 }