fix NRE in packager dispose (#561)

diff --git a/Xamarin.Forms.Platform.Android/VisualElementPackager.cs b/Xamarin.Forms.Platform.Android/VisualElementPackager.cs
index 891d438..0ad1b42 100644 (file)
--- a/Xamarin.Forms.Platform.Android/VisualElementPackager.cs
+++ b/Xamarin.Forms.Platform.Android/VisualElementPackager.cs
@@ -52,10 +52,13 @@ namespace Xamarin.Forms.Platform.Android
                                        _childViews = null;
                                }
 
-                               _renderer.Element.ChildAdded -= _childAddedHandler;
-                               _renderer.Element.ChildRemoved -= _childRemovedHandler;
+                               if (_renderer.Element != null)
+                               {
+                                       _renderer.Element.ChildAdded -= _childAddedHandler;
+                                       _renderer.Element.ChildRemoved -= _childRemovedHandler;
 
-                               _renderer.Element.ChildrenReordered -= _childReorderedHandler;
+                                       _renderer.Element.ChildrenReordered -= _childReorderedHandler;
+                               }
                                _renderer = null;
                        }
                }