The Seven Network reports officials ran out of election papers in the booth of Epping in the electorate of McEwen mid-afternoon forcing the booth to close.
A Liberal Party scrutineer's told the network that when the booth reopened around 100 ballot papers were handed out which hadn't been signed by Electoral Commission workers.
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The mistake would render the votes invalid in an electorate that will be won on a knife's edge.
Labor candidate Rob Mitchell won the seat of McEwen by a mere seven votes in 2007 but a federal court challenge by Liberal MP Fran Bailey saw her finally declared the winner eight months later to retain her electorate by only 31 votes.
