Actually I was accidentally doing a union with an imported STL made by OpenSCAD that had degenerate triangles due to a misplaced curly bracket. There is a bug though because the ERROR does not set the exit status so I had missed it.
I have started getting this error since installing the new release when generating pngs from the command line but it seems to carry on and generate the image. Not sure if ti is related to the release
Looking at the same preview in the GUI I don't get an error, so I have no idea how to find it as the picture is my entire assembly.
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