diff --git a/SettingsView.iOS/Cells/PickerCellRenderer.cs b/SettingsView.iOS/Cells/PickerCellRenderer.cs
index c4c0ad4..b7baee2 100644
--- a/SettingsView.iOS/Cells/PickerCellRenderer.cs
+++ b/SettingsView.iOS/Cells/PickerCellRenderer.cs
@@ -150,6 +150,11 @@ protected override void Dispose(bool disposing)
                     _notifyCollection.CollectionChanged -= ItemsSourceCollectionChanged;
                     _notifyCollection = null;
                 }
+                if (_selectedCollection != null)
+                {
+                    _selectedCollection.CollectionChanged -= SelectedItems_CollectionChanged;
+                    _selectedCollection = null;
+                }
             }
             base.Dispose(disposing);
         }
diff --git a/nuget/SettingsView_mac.nuspec b/nuget/SettingsView_mac.nuspec
index 505c5ba..944d9c0 100644
--- a/nuget/SettingsView_mac.nuspec
+++ b/nuget/SettingsView_mac.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
     <metadata>
         <id>AiForms.SettingsView</id>
-        <version>0.2.9</version>
+        <version>0.3.0</version>
         <title>SettingsView for Xamarin.Forms</title>
         <authors>kamu</authors>
         <owners>kamu</owners>
@@ -16,7 +16,7 @@ There are various cells such as (LabelCell,ButtonCell,CommandCell,SwitchCell,Che
         <releaseNotes>
 ## Bug fixes
 
-* [PickerCell] When the SelectedItems is changed programmatically, the new value text is not shown. (#16)
+* [PickerCell] When opening two times, a null exception occurs. (#39)
         </releaseNotes>
         <tags>Xamarin.Forms TableView Cell Setting Configuration Option ListView UITableView RecyclerView ReOrder DragDrop</tags>
         <language>en-US</language>