Thanks for writing and for reporting this.
To be able to handle the case, we need to know how to reproduce the issue on our side.
Is it possible for you to produce a very simple project and share with us the steps we need to take in order for the exception to occur?
To be able to attach your project, you will need to open a new support ticket.
It it's easier for you, you may try to reproduce the issue using our Telerik Examples application and let us know how to do it on our side. We will make sure to debug it.
Thanks for your time.
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