Fixes NullReferenceException in #1354

This issues a fix for the NullReferenceException that occurs in v3.4 of AvalonDock when the _draggingItem is null on MouseEnter (reference issue #1354).
8 years ago · 1b0114dcb3
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;