The given model geometries do not overlap.
Structure semantics calling the Geometry and Topology common geometry API should handle the well- defined HRESULT error code MODELTOPOLOGY_E_NOOVERLAP.
The input model geometries do not have common geometry within the distance tolerance.
None if the calling code is handling MODELTOPOLOGY_E_NOOVERLAP properly.
What You Should Do
Report to the concerned application that the common geometry failure is not properly handled.