Whonix ™ provides VM images that operate inside of the VM. Whatever occurs inside a VM should never lead to a crash (status aborted) of the host virtualization software, VirtualBox.
Unfortunately, I cannot add anything else to that.
The General VirtualBox Troubleshooting Steps include
consider running Whonix ™ from a Linux computer rather than Windows computer, see Host Operating System Selection.
I doubt you switched your host operating system to Debian
buster? Because this very most likely wouldn’t happen there.
Therefore the only option left is this:
Consider reporting a bug against upstream VirtualBox [archive] – VirtualBox bugtracker [archive] / VirtualBox forums [archive]. Logs are useful for developers to isolate the problem. 
To capture the VirtualBox log:
right click a VM →
Show Log... →
- Zip the log.
- Report to VirtualBox support.
I haven’t seen that happened yet either.