Premier Division leaders Whitstable scored twice in injury time to beat Erith & Belvedere 2-1 in a dramatic finish at the Belmont.
Town, trailing to a first-half Ryan Fowler goal, looked set to suffer just a third league defeat of the season.
But a dramatic late turnaround saw Joe Healy level in the third minute of added time before fellow substitute Dean Grant scored a 95th-minute winner.
Jamie Coyle’s champions-elect remain 18 points clear of second-placed Fisher, who won 5-0 at Holmesdale.
Larkfield & New Hythe, in third, lost to a stoppage-time goal at home to Phoenix Sports.
Tyler Ibe appeared to have rescued a point for the Larks after converting an 88th-minute penalty.
But Jamarie Brissett added to his opener by scoring the winner in the first minute of added time.
Bearsted were twice pegged back in a 2-2 draw at home to Hollands & Blair.
Kevin Stevens’ fourth-placed Bears struck through Jack Palmby and Sam Flisher, with Dieko Falade and Luke Exall on target for the visitors.
Rusthall, in fifth, lost a two-goal lead away to Corinthian.
Charlie Clover’s early goal and a Thompson Adeyemi strike put the Rustics in charge but Tom Mitcham and an 87th-minute equaliser from Jamie Billings made it 2-2.
FA Vase semi-finalists Punjab United beat relegation-threatened Faversham Strike Force 2-1 courtesy of Roman Campbell and Will Johnson-Cole. Josh Oliver replied for Strike Force.
Snodland Town slipped to 11th, five points outside the play-offs, after losing 2-1 at Sutton Athletic.
Sam Wood gave Town a fifth-minute lead but Conor Evans levelled and Omotunmise Akanni won it for Sutton just past the half-hour mark.
Jamie Philpot’s second-half penalty gave Chislehurst Glebe a 1-0 win at bottom side Stansfeld.
Hythe remain seven points from safety after their match at Tunbridge Wells was postponed due to a waterlogged pitch.
Alfie Clark and Rameses Meseorisa scored injury-time goals as Lordswood beat Staplehurst 2-0 to reach the Division 1 Cup final.
