Segmentation fault (core dumped)

[BenKoth]

I'm having trouble figuring out why my R call is suddenly failing with a Segmentation fault (core dumped) error. I've tracked it down to the TryEvaluate call:
IntPtr pointer = this.GetFunction<R_tryEval>()(handle, environment.DangerousGetHandle(), out errorOccurred);

I'm using Ubuntu 16.04 and I've tried installing several different versions of R to see if it was a problem with R (4.0, 3.6, 3.4)
Probably not super helpful, but the statement being executed when it fails is:
post(Tree, file="output/Error2withQChanges_NoPrune.ps"

Any ideas how to find out what is causing the segmentation fault?