Former Queens state judge turned district attorney candidate Gregory Lasak has seen a recent manslaughter conviction secured in his courtroom reversed on appeal, after the panel found he failed to properly handle concerns of racial bias in a move that kept a prospective juror who was black off the case.

The reversal and remittance for a new trial in Queens Supreme Court comes during the early days of Lasak’s bid to replace Richard Brown, who announced last week he wouldn’t run for re-election as DA.