the formatter for column "{colId}" threw while formatting a previous value, so the diff hover shows the raw one.

Warnings reference › diff-before-format:*

Identifier

diff-before-format:*

Raised by

The grid (rendering)

Since

1.61.0

What happened

The diff hover formats the previous value with the column's own formatter so that before and after read alike, and the formatter threw on the old value. The hover falls back to the raw value, so it is still correct, just unformatted. Nothing else in the grid is affected.

The fix

The error is attached to the console line. A formatter that assumes a shape the older row did not have is the usual cause - the previous row is reconstructed from the diff, so fields it never carried are absent.

Reference

Covered in full at the API reference.