A batch of a collaboration brew by Six String Brewing in NSW has been recalled.

Mr Black Coffee Milk Stout, a collaboration between the brewery and Mr Black coffee liqueur, was initially launched back in May.

Last week Food Standards Australia New Zealand published a recall notice for the batch, brewed in August, which is dated with a best before of 12/05/21.

The 8% abv beer has been recalled due to “the potential for alcohol to exceed marked alcohol content and possibility for can to rupture due to a secondary fermentation,” the recall said.

It is the second batch of the beer which the Six String brewed again due to high demand for the collab beer.

The brewery told Brews News this was the first incident of this type in eight years of brewing, and the team wanted to act as fast as possible after being alerted to the issue.

Its quick response meant that once they had alerted FSANZ on Friday they were able to send an email out alerting wholesalers by Friday night, having engaged their product recall plan.

Six String said that it had so far only been alerted to a handful of people that had any cans remaining.

“While we don’t imagine there are many cans out there, given that it is a high abv there will be some that have held onto a few cans,” a spokesperson said.

“We are feeling terrible for these people and are more than happy to refund anyone that still has cans.

“We are encouraging them to carefully dispose of the cans (wrap in a tea towel or something that will contain the can if it ruptures and carefully put in the bin) and get in contact [with us to] organise a refund.”

While lab testing is ongoing, Six String has said there were no bacterial infections in the beer and the abv has not increased significantly in the samples tested.

However, they said there is a lot of excess carbonation and there may have been a delay in adding the coffee grounds which may have increased the sugars in the brew.

“This recall has motivated us to only up our testing processes when releasing seasonal beers in particular prior to release,” they said.

“The feedback we have had from the recall over the weekend has been positive with most people saying they enjoyed it so much that their beers were finished months ago and just wanting us to brew it again.

“We hope that this will not take away from the fact that it was a great beer, there was a lot of great feedback about the beer itself and [it’s] unfortunate that something we had not foreseen has meant people are not able to hold onto those cans they were keeping for a special occasion.”

More information on safely disposing of the product and refunds is available here.