Mon Jan 20 2020 13:08:16 UTC
I've stopped it crashing. It was bombing out at an 'assert' line,. Removing it fixed it!
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ID Product Component Assignee Status Resolution Summary Changed
225528 Base System kern bugs Closed DUPLICATE Kernel panic pf purge 2018-01-29
One bug found.

as

File a new bug in the "kern" component of the "Base System" product