Captain Jay Williams denied play-off chasing Chesterfield a fourth win in six games as relegation-threatened Crawley salvaged a 1-1 draw at the Broadfield Stadium.
Williams headed in a Ronan Darcy cross at close range in the final minute of added time to cancel out Liam Mandeville's strike just before the interval.
Chesterfield Take Control
Crawley striker Danilo Orsi had a shot blocked by the legs of keeper Zachary Hemming early on, but this was the nearest the hosts came as Chesterfield bossed the first half.