Hi Ilaya,
Thank you for contacting Syncfusion support.
We have checked the reported issue “Throws exception when setting GridTableSummaryRow without Title” in DataGrid Xamarin.Forms, which is an expected behavior. As per the implementation, when setting ShowSummaryInRow as true, you need to set Title for GridTableSummaryRow.
Please let us know, if you have any concern.
Regards,
Subburaj Pandian V