fusermount: failed to unmount /path: Device or resource busy

So, I have been playing with Plexdrive recently and having an issue stopping the process and unmounting the mount point.

When I executed

$ fusermount -u /path/to/plexdrive

The command failed with an error

fusermount: failed to unmount /path/to/plexdrive: Device or resource busy

Cause

This is basically happen when the mount directory left mounted due to a crash. In my case, I forcefully killing the Plexdrive process.

Solution

The solution is pretty easy. What you have to do is just execute

$ sudo umount -l /path/to/plexdrive

and you are good to go.