Sketchup Pro: plane equation for CFace is not valid


Hi, I’ve been working on a SketchUp exporter and when I try to open the exported models in SketchUp Pro, I get these errors sometimes:

So I went and removed the faces which area was < 0.0001, and it solved the errors. The thing is, when doing that I remove more faces than SketchUp would if I let it fix my models, so may I know exactly when SketchUp flags a plane equation as invalid? I don’t want to be removing valid faces unnecessarily.