m_CachedPolyRef == -1 -- LogSpam or Error?

I'm changing parentage of objects, while enabling & disabling hierarchies - and unity is throwing this error. m_CachedPolyRef == -1 UnityEngine.GameObject:SetActive(Boolean) I'm not really sure exactly what it means, or if I should attempt to fix it. The psuedocode of what I'm doing boils down to something like this... Transform A; Transform B; Transform C; B.parent = A; C.SetActive(false); B.parent = C; C.SetActive(true); A.SetActive(false); Is this just Unity error spam? Or is this signaling a legitimate failure?