An unhandled exception of type 'System.NullReferenceException' occurred in Telerik.WinControls.GridView.dll

[Jo]

Greetings,
I am getting the following exception when touch quickly different editable rows in the grid. The Telerik version is 2012.1.321.40.


System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.WinControls.UI.GridViewEditManager.BeginEdit()
   at Telerik.WinControls.UI.GridViewEditManager.OnPositionChanged(PositionChangedEventArgs args)
   at Telerik.WinControls.UI.GridViewEditManager.Telerik.WinControls.UI.IGridViewEventListener.ProcessEvent(GridViewEvent eventData)
   at Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
   at Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
   at Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
   at Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
   at Telerik.WinControls.UI.GridViewSynchronizationService.RaiseCurrentChanged(GridViewTemplate template, GridViewRowInfo row, GridViewColumn column, Boolean user)
   at Telerik.WinControls.UI.BaseGridNavigator.SelectCore(GridViewRowInfo row, GridViewColumn column)
   at Telerik.WinControls.UI.BaseGridNavigator.Select(GridViewRowInfo row, GridViewColumn column)
   at Telerik.WinControls.UI.GridRowBehavior.SelectPositionOnMouseDownLeft(MouseEventArgs e, GridRowElement rowElement, GridCellElement cellElement)
   at Telerik.WinControls.UI.GridRowBehavior.OnMouseDownLeft(MouseEventArgs e)
   at Telerik.WinControls.UI.GridRowBehavior.OnMouseDown(MouseEventArgs e)
   at Telerik.WinControls.UI.BaseGridBehavior.OnMouseDown(MouseEventArgs e)
   at Telerik.WinControls.UI.RadGridView.OnMouseDown(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at Telerik.WinControls.RadControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

[George]

Hello Jo,

Thank you for contacting us.

I am not able to determine the what the problem may be from the provided information. I would like to kindly ask you to send me some additional details along with steps which will reproduce the issue.

Looking forward to your response.

Regards,
George
Telerik

[Supriya]

Hi ,
I am getting same error after I upgraded Telerik from 2012 Q2 to 2013 Q3 using VS 2013.

An unhandled exception of type 'System.NullReferenceException' occurred in Telerik.Windows.Controls.FixedDocumentViewers.dll

Please advise?

[Dess | Tech Support Engineer, Principal]

Hello Supriya,

Thank you for writing.

The provided information is not enough for me to reproduce the error on my end. Without a reproducible scenario or a sample code snippet replicating the issue we can make only conjectures what is causing the problem. That is why I would kindly ask you to specify the exact steps how to reproduce the problem or give us some code snippet which leads to the described error. Alternatively, you can open a support ticket where you can attach a sample project so I can investigate the precise case and assist you further. Thank you in advance.

I am looking forward to your reply.

Regards,
Dess
Telerik