Value Overflow Incident of Bitcoin
This incident happened in August of 2010. It is known as Value Overflow incident. Value Overflow Is a bug. This bug created 184 billion bitcoins.
It was fixed within 5 hours. So not many people noticed it. After that they released a Bitcoin client v 0.3.10. And with this update all the extra coins were removed. Don't worry the error was "Forked Out". It is completely removed from blockchain.