Sea of Thieves has been delayed, according to a report from the game’s developer. Forsaken Shores, which will add a new volcanic area called ‘Devil’s Roar’ to the game’s map, as well as merchant “cargo runs” and rowboats, was originally supposed to release today (September 19). However, an unanticipated error in the game has led to complications, and it’s going to take the studio a little more time to get everything straightened out.

“This decision was not taken lightly, and we know this may disappoint fans who were looking to play the update this week,” developer Rare wrote when the delay was announced. “That said, our priority is to deliver a stable, polished and bug-free experience and we feel that the extra week of development will enable us to do this.”

Joe Neate, Sea of Thieves’ executive producer, expanded on the decision in a forum post after the announcement. “We have just had a weekend of Pioneer testing, which has highlighted a memory issue in the build, which is resulting in an unstable build where a large number of our Pioneers were experiencing crashes,” Neate explained. “From our investigations this is a complex issue that we are working through solving, but as such we do not feel in a position to release Forsaken Shores to our players with confidence this week.”

So, it seems that players will have to wait to explore the Forsaken Shores update. Fortunately, the delay isn’t a major one: the release of Forsaken Shores has been moved up a week to September 27. Rare’s goal for this week will now be to resolve the memory issue and test it with Pioneers to ensure that the update is consistently working as it should. Beyond that, everything else should proceed as planned for the game.

Sea of Thieves is available now for Xbox One and Windows PC.