19 Feb 2020 15:44
DataGrid: NullReferenceException is thrown when navigating away from the page while the filtering UI is displayed in Shell
If you open a datagrid's filter pop-up, navigate away from the page, then go back to the page, the filter pop-up will still be open.
If you attempt to close it, by way of the "X", the app will crash. In debug mode, a null reference error will occur. If navigating away from the grid with the filter closed, no crash will happen.