Welcome back!
No VM should be capable for crashing the VirtualBox host software. That is a VirtualBox host software bug which is not developed by and cannot be fixed by Whonix. This bug can be reported against VirtualBox upstream.
VirtualBox has various issues.
The internet is full of discussions that lead to no solution. Hard to find good information. It is unhelpful to ask in arbitrary places about it as this only leads to more discussions which go nowhere. The only option is to find out what information VirtualBox developers are asking for, to write a good bug report and to report to virtualbox.org developers.
For inspiration on how to write a good bug report, see:
VirtualBox Integration
I guess in your case at minimum the VirtualBox VM log and maybe the VirtualBox host log would be useful. Please also mention VirtualBox host version, host operating system and version.