From f19e5c1153377327641bdfaec3c63a627ca281b9 Mon Sep 17 00:00:00 2001
From: parax0 <parax0@github.com>
Date: Wed, 16 Mar 2016 22:22:10 -0600
Subject: [PATCH] Added check for no clean index

---
 src/Editor/WorldEditor/CWorldEditor.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Editor/WorldEditor/CWorldEditor.cpp b/src/Editor/WorldEditor/CWorldEditor.cpp
index 1a104c78..1af81406 100644
--- a/src/Editor/WorldEditor/CWorldEditor.cpp
+++ b/src/Editor/WorldEditor/CWorldEditor.cpp
@@ -677,6 +677,14 @@ void CWorldEditor::OnUndoStackIndexChanged()
     int CurrentIndex = mUndoStack.index();
     int CleanIndex = mUndoStack.cleanIndex();
 
+    if (CleanIndex == -1)
+    {
+        if (!isWindowModified())
+            mUndoStack.setClean();
+
+        return;
+    }
+
     if (CurrentIndex == CleanIndex)
         setWindowModified(false);