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ValueError: Null TopoDS_Shape object with offset of circle
ellipsis_big = 1
ellipsis_small = 1
s = cq.Sketch().ellipse(ellipsis_big, ellipsis_small).wires().offset(-0.1, mode="s")
Any value of ellipsis_small different than 1 will not cause a bug. Using circle or ellipsis_small = ellipsis_big causes ValueError: Null TopoDS_Shape object. Currently I use 0.999 to alleviate the issue.