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Maidstone were held to a goalless draw at Grays on Monday night.
They're now eight points clear at the top of the Ryman League Premier Division having played two games more than second-placed Hendon.
Sonny Miles returned to the starting line-up in place of injured skipper Steve Watt and Matt Bodkin came in for Frannie Collin as United made it seven matches unbeaten.
Tom Mills saw an early half-volley go just over and Jack Parkinson tried his luck midway through the first half while Stones had a penalty shout for handball turned down after Alex Brown's shot was blocked by Kenny Beaney.
Craig Stone cleared off the line from Bradley Fortnam-Tomlison as Grays threatened for the first time, with Jay May going close for Stones on the stroke of half-time.
United looked the more likely winners as the second half wore on, Billy Bricknell and May denied before Brown fired over.
Maidstone: Worgan, Stone, Mills, Miles, Huke, Rogers (Porter 63mins), Bodkin (Collin 83), Parkinson, May, Brown (Paxman 86mins), Bricknell. Subs not used: Starkey, Godmon.
Attendance: 507