Not sure what else to say except, "don't do that" and bind ctrl+shift+v to something innocuous in Geany so it hopefully will hide the crashy VTE accelerator and you won't do it accidentally.
@elextr I tried your suggestion of binding it to something else (I bound it to "Properties"), and it was successful in preventing Geany from crashing.
Seeing the critical nature of this issue as unsaved valuable work could be lost, why not implement a hotfix which binds `Ctrl+Shift+V` to a null action by default? We can remove this once upstream fixes the issue.