diff --git a/Ooui/Ooui.csproj b/Ooui/Ooui.csproj
index a07f723..8dbfbc9 100644
--- a/Ooui/Ooui.csproj
+++ b/Ooui/Ooui.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <Version>1.0.0.2</Version>
+    <Version>1.0.0.3</Version>
     <Description>A tesses webserver port of https://github.com/praeclarum/Ooui</Description>
     <PackageTags>Ooui;UI;CrossPlatform</PackageTags>
     <PackageIcon>Icon.png</PackageIcon>
diff --git a/Ooui/Session.cs b/Ooui/Session.cs
index 0f7864c..3c7eb2f 100644
--- a/Ooui/Session.cs
+++ b/Ooui/Session.cs
@@ -13,6 +13,17 @@ namespace Ooui
 
         protected readonly List<Message> queuedMessages = new List<Message> ();
 
+        protected readonly System.Threading.SemaphoreSlim slimSema=new System.Threading.SemaphoreSlim(0,1);
+
+        protected void LockQueue()
+        {
+            slimSema.Wait();
+        }
+        protected void UnlockQueue()
+        {
+            slimSema.Release();   
+        }
+
         protected readonly bool disposeElementAfterSession;
         readonly Action<string, Exception> errorLogger;
 
diff --git a/Ooui/WebSocketSession.cs b/Ooui/WebSocketSession.cs
index e4fca77..5837ac8 100644
--- a/Ooui/WebSocketSession.cs
+++ b/Ooui/WebSocketSession.cs
@@ -92,7 +92,7 @@ namespace Ooui
                 //
                 var messagesToSend = new List<Message> ();
                
-                lock (queuedMessages) {
+                LockQueue();
                     messagesToSend.AddRange (queuedMessages);
                     queuedMessages.Clear ();
 
@@ -107,7 +107,7 @@ namespace Ooui
                    //Console.WriteLine ("TRANSMIT " + json);
                     sendMsg?.Invoke(WebSocketMessage.Create(json));
                     //task = webSocket.SendAsync (outputBuffer, WebSocketMessageType.Text, true, token).ConfigureAwait (false);
-                }
+                UnlockQueue();
                
             }
             catch ( System.AggregateException ex)