[Bug]: DataGrid Columns, Select Column Multiple example causes an exception

[blenke]

Blazorise Version

latest

What Blazorise provider are you running on?

None

Link to minimal reproduction or a simple code snippet

On your docs web page, https://blazorise.com/docs/extensions/datagrid/columns scroll to the Select Column Multiple example and click the Activity. It will cause an exception and crash the web page.

Steps to reproduce & bug description

What is expected?

no exception

What is actually happening?

exception and page hangs

What browsers do you see the problem on?

No response

Any additional comments?

No response