From 0bcddfdfd72e0c465214e1ecb489bf1eccdfcf50 Mon Sep 17 00:00:00 2001
From: Eli Belash <elibelash@gmail.com>
Date: Fri, 30 Aug 2019 20:55:24 +0300
Subject: [PATCH] DefaultGraphStack: Minor perf-op

---
 src/TensorFlowNET.Core/Graphs/DefaultGraphStack.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/TensorFlowNET.Core/Graphs/DefaultGraphStack.cs b/src/TensorFlowNET.Core/Graphs/DefaultGraphStack.cs
index 4d843d6b..3dc77859 100644
--- a/src/TensorFlowNET.Core/Graphs/DefaultGraphStack.cs
+++ b/src/TensorFlowNET.Core/Graphs/DefaultGraphStack.cs
@@ -39,7 +39,7 @@ namespace Tensorflow
 
         public Graph get_controller()
         {
-            if (_stack.Count(x => x.IsDefault) == 0)
+            if (_stack.Count == 0 || _stack.Count(x => x.IsDefault) == 0)
                 _stack.Add(new StackModel {Graph = tf.Graph(), IsDefault = true});
             for (var i = _stack.Count - 1; i >= 0; i--)
             {