fix NullReferenceException in LayoutAnchorableTabItem

8 years ago · cc58ce44b6
1 changed files with 2 additions and 1 deletions
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutAnchorableTabItem.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutAnchorableTabItem.cs
@ -181,7 +181,8 @@ namespace Xceed.Wpf.AvalonDock.Controls
    {
      base.OnMouseEnter( e );
-      if( _draggingItem != this &&
+      if( _draggingItem != null && 
          _draggingItem != this &&
          e.LeftButton == MouseButtonState.Pressed )
      {
        var model = Model;