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Jay Saunders declared Bromley his bogey side after Maidstone lost to the Lillywhites again.
Neil Smith's men completed a hat-trick of 2-0 National League wins over United at the Gallagher on Tuesday night, to go with last season's Kent Cup win.
Stones boss Saunders said: "I don’t have much luck against Bromley.
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"I can’t remember beating them since I’ve been manager, so maybe they’re my bogey side, but they came here and did very well, I thought they worked their socks off.
"First half they won every first and second ball and you can’t start slowly in this league, it doesn’t matter who you’re against, but I just don’t think we got going first half."
Bromley led late in the first half when a Louis Dennis free-kick appeared to go in off Stones defender Magnus Okuonghae.
WATCH: Manager reacts to home defeat
They made the safe in the last minute, Dennis the scorer after Luke Wanadio's shot was blocked.
It was Stones' first home defeat and saw them drop to eighth in the table.
Saunders said: "The record was going to come to an end at some point. It’s disappointing.
"I thought first half we never really got going, we looked like we were still on the way home from Barrow and that’s taking nothing away from Bromley.
"Second half we grew into it and looked like we were putting them under pressure but I suppose when you’re leaving yourself that open and really pushing for it, taking gambles and pushing extra bodies forward, you’re liable to them nicking another goal."
Read the match report from Maidstone's 2-0 defeat by Bromley