Unable to calculate area centroid

Happens randomly but fairly consistently.
AreaCentroid fail.3dm (31.6 KB)

Hi Asterisk - this is almost always due to one or more surfaces having trims the command does not like- in this case the one on the left. DupBorder (if it is actually trimmed) UntrimAll, and then retrim if needed.

I’ll add this example to the bug heap.