Madison brewery MobCraft has an issue with some of its cans of Batshit Crazy.

The brewery said in an email blast that it has “fixed the problem with the canning line, canned a new batch, and swapped out everything” it could find in the market that was bad.

According to MobCraft, 4-packs of cans with a blue plastic top are good; cans topped with black toppers are the ones that have gone “south.”

If you’ve got a bad pack, let the brewery know by emailing them at beer@mobcraftbeer.com.

Our take: Bad things happen to good breweries. It’s unfortunate that MobCraft had some canning issues, but the fact that they’re allowing people to contact them about bad product is a good move.