Hi Viktor,
Thanks for contacting syncfusion forum.
Query: Tree Grid Trows error when adding to empty list
It is a known issue. We already logged a bug for the same as “Tree Grid Component Crash if empty”. At Syncfusion, we are committed to fixing all validated defects (subject to technical feasibility and Product Development Life Cycle ) and the fix for the issue will be included in Third week of July 2021 patch release.
You can now track the current status of your request, review the proposed resolution timeline, and contact us for any further inquiries through this link.
Please get back to us if you need any further assistance.
Regards,
Pon selva