This is all perfectly normal. Some minor bugs occur, people claim the sky is falling. I say cool your boots a bit there old chum and do something else for a bit if it bothers you.
Where I work this would make a rollback necessary within 5 minutes of detection. A hard rollback with DB and code and everything.
After that a message to all users with details, a meeting call and further planning.
Bugs happen. But there are development, testing, prelive and final approvement environments in place to sieve the gravest bugs out - FOUR stages before going live - and in the gaming industry you can add private and public betas to add more specific tests. All with a full regression testset, all with a full new feature testset.