If uiTableModelInsertRow() is called on an active uiTable, the table will then try to fetch one row more than what the model provides.
If the table already has a lot of content, the invalid fetch won't occur until you scroll right down to bring the last row into view.

Seems to be windows-specific.

example here:
https://github.com/bcampbell/libui/blob/destruc-table/examples/destruc-table/main.c