Peterborough extended their unbeaten League One run to eight games - but Brighton did enough to earn a draw.
Defender Craig Morgan did have the ball in the net but referee Steve Bratt ruled the Welsh international had pushed Albion defender Matt Richards.
Morgan again went close with a header seconds later after Tom Williams delivered strongly from the left.
Glenn Murray blazed over for Brighton in the first half, while Charlie Lee and Dominic Green went close for Posh.
Peterborough: Lewis, Martin, Morgan, Zakuani, Williams, Batt (Green 80), Lee, Coutts, Whelpdale (Mclean 62), Boyd, Mackail-Smith. Subs Not Used: McKeown, Hyde, Gaughran.Booked: Lee, Morgan, Mackail-Smith, Zakuani.
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Att: 5,772
Ref: Steve Bratt (W Midlands).
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