Github is down since 7am (GMT +8), and it's causing a lot of issues for users that used it for hosting repositories.
Error 500
Basically, you would not face any issue if you are not signed in, but you cannot access anything on GitHub once you signed in. The official GitHub twitter status said they had stopped all the webhook integration to GitHub at the same time.
According to their blog, this is due to an issue on their database (MySQL) failure, and this issue had last for more than 10 hours, which is really annoying.
Time to switch to gitlab? hehe
Until now, the site is still not yet accessible. I hope the team are able to resolve it ASAP.
You can check the status at https://status.github.com/messages , or the image below.