The fix was released before it and running on pools before it effected normal users.
There was no hardfork or network downtime as a result of this issue, pools and resource nodes are functioning normally.
Version v1.5.7 Main
https://github.com/ubiq/go-ubiq/releases/tag/v1.5.7
users in solo-mining have a lot of issues with the blockchain
Its small bug fix release for a crash that effected mining pool nodes still running the old version. fix has been pushed to GitHub.
new binaries uploaded to https://github.com/ubiq/go-ubiq/releases/tag/v1.5.7
You need to upgrade unless you are running a pool (or your own personal pool)