From 2a383f288eeb3ac52100384122211433cc7af090 Mon Sep 17 00:00:00 2001
From: "E.Z. Hart" <hartez@gmail.com>
Date: Thu, 11 Mar 2021 10:54:49 -0700
Subject: [PATCH] Add missing lock in IStyle.Apply

---
 src/Controls/src/Core/Style.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Controls/src/Core/Style.cs b/src/Controls/src/Core/Style.cs
index 9a3c9d912..78e17f346 100644
--- a/src/Controls/src/Core/Style.cs
+++ b/src/Controls/src/Core/Style.cs
@@ -85,7 +85,11 @@ namespace Microsoft.Maui.Controls
 
 		void IStyle.Apply(BindableObject bindable)
 		{
-			_targets.Add(new WeakReference<BindableObject>(bindable));
+			lock (_targets)
+			{
+				_targets.Add(new WeakReference<BindableObject>(bindable));
+			}
+
 			if (BaseResourceKey != null)
 				bindable.SetDynamicResource(_basedOnResourceProperty, BaseResourceKey);
 			ApplyCore(bindable, BasedOn ?? GetBasedOnResource(bindable));