Improve RenderManager Object Structure

Util/FrameReader.cs

@@ -126,9 +126,10 @@ namespace ADOFAIRenderer.Util
         
         private static void PushToQueue(long frame, byte[] rawBytes)
         {
-            lock (RenderManager.ImageQueue)
+            if (!RenderManager.Instance) return;
+            lock (RenderManager.Instance.ImageQueue)
             {
-                RenderManager.ImageQueue[frame] = rawBytes;
+                RenderManager.Instance.ImageQueue[frame] = rawBytes;
             }
         }