Sat Jan 19 2019 13:11:27 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
231220 Ports & Packages Individual Port(s) ports-bugs New --- devel/flyspray is incompatible with PHP71 2018-09-07
One bug found.

as

File a new bug in the "Individual Port(s)" component of the "Ports & Packages" product