A "computer system problem" forced the cancellation of NSW Lotteries' $2 Jackpot draw number 7719, dashing the hopes of some 100,000 ticket holders for a big win.
While unable to provide great detail due to security precautions, John Vineburg, spokesman, NSW Lotteries, said the problem was detected early last week and checks were made to make sure no other lotteries were affected.
"It was a software problem, a systems error and other factors that led to a problem with the online gaming systems that assist in the allocation of tickets. It was allocating duplicate numbers of the one to 200,000 tickets available," he said.
Vineburg said 200,000 tickets were sold, but due to duplicate purchases, the cancellation will affect around 100,000 people.
He was unable to provide details on the organisation's infrastructure, systems and vendors.
Also citing security reasons, Vineburg was unable to say how many IT professionals were involved in solving the problem, but said it was a "major issue for our IT people who worked flat out to get a resolution".
Vineburg said the only procedures in place to ensure that this does not happen again involves the process of checking and rechecking the software and overall system and identifying what exactly went wrong this time and "making sure it can't happen again -- as far as humanly possible".
"We appreciate it's a nuisance, but we are minimising the process. By cancelling the draw we are protecting the integrity of the draw and the interests of players," Vineburg said.
Customers holding a ticket in the draw 7719 will receive a full refund of the entry cost on presentation of their ticket, or free ticket certificate, at any NSW Lotteries Online agency.
The $2 Jackpot Lottery drawings will resume today with draw number 7720 where the jackpot stands at $3,950,000.