Rumors have been swirling for a few weeks about issues with one of Bottle Logic Brewing’s recently released beers, and now the Anaheim, Calif.-based brewery has made it official.

In a statement on it’s website, Bottle Logic has announced it is recalling bottles of its Byzantine Vision, a a 10.7 percent ABV Baltic porter conditioned on hazelnuts, pistachios, and walnuts before being finished with wild honey and aged in bourbon barrels and was released packaged in 500ml bottles in January. According to a statement on Bottle Logic’s website, brettanomyces was found in bottles that were tested after customers called the brewery to complain about “off flavors.”

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“Byzantine Vision was finished by filtering the beer through several hundred pounds of nuts,” reads a post on the brewery’s website. “To create this “filter” we crushed and combined all three types of nuts together in a hopback, which was then flushed with steam to sanitize the combination.  We have determined that the steam was unable to effectively penetrate the core of the nuts, providing the lingering natural yeast on the surface of the nuts a perfect opportunity to make its way into the finished beer.”

According to Bottle Logic, bottles stored at or below 35-40 degrees Fahrenheit should have no issues, but bottles stored above those temperatures “are likely to have developed an unintentional tart cherry off-flavor and intense carbonation as a result of an in-bottle refermentation due to the presence of a few rogue brettanomyces cells.”

Customers with affected bottles have two option: a refund or replacement with a different beer. If the refund is chosen, customers who purchased bottles on Eventbrite can take any bottles to the brewery between April 5-April 30 for an immediate refund of the entire Eventbrite fee, while customers who purchased bottles from authorized retailers will receive a $30 gift card.

If customers choose to replace the affected bottle, they can be taken to the brewery between May 1-May 31 to swap out for the next Stasis Project Series release.