Just at a glance it looks like the main thread was locked up waiting for a message from a socket. Could be wrong but I wonder if the saving thread reports done to the master with a socket write. And there's no timeout set.

Oops... that'll teach me to change the name and not re-test.

Hello All,
As it seems binbinhfr is currently unavailable to update this mod I've taken it up and started maintaining it.
You can find it HERE