Ubuntu 19.04 crashes on Virtualbox 6.0.12

[Roli]

Okay, that was wrong. In the meantime I had a crash when not closing Chrome and also was able to close Chrome without crash. But Chrome was involved in all crashes.

[Tatsukishi]

I've been having this exact issue too for some time now, most recently just now with VB 6.1.12 and a Xubuntu 20.04 Guest shortly after opening an Electron (chromium based) app (VS Code).
It has happened while opening/working with Atom editor too (another Electron app) and sometimes after changing to a not-yet-loaded Firefox tab from a restored session.