Pokemon Go developer Niantic says it is aware of an issue that makes certain Pokemon invisible for some players.

Skrelp and Clauncher were recently added to Pokemon Go for the game’s Rivals Week event. Some players are unable to see the new creatures on-screen when trying to catch them, making the monsters essentially impossible to capture.

In a tweet, Niantic Support said this is impacting players using an older version of the software. Niantic says players can update their app to the newest version while the developers work on a fix.

“Trainers, due to a bug, Skrelp and Clauncher cannot be seen on versions of Pokémon GO older than 0.205. As a result, Trainers on older versions of the app may not be able to catch them. Please update your app to the latest version as a workaround, while we work on a fix.”

Trainers, due to a bug, Skrelp and Clauncher cannot be seen on versions of Pokémon GO older than 0.205. As a result, Trainers on older versions of the app may not be able to catch them. Please update your app to the latest version as a workaround, while we work on a fix.

— Niantic Support (@NianticHelp) April 13, 2021

Pokemon Go just had a record year, with the game earning over $1 billion in 2020 alone. Overall, the game has earned well over $4 billion since its launch in 2016.

Niantic and Nintendo recently announced a partnership to develop more AR games based on Nintendo franchises, beginning with a Pikmin title. The game will be the first project for Niantic’s Tokyo studio, which was established in 2018.

Story first reported by NME.

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Logan Plant is a news writer for IGN, and the Production Assistant for Nintendo Voice Chat, IGN’s weekly Nintendo show. You can find him on Twitter at @LoganJPlant.