Kerbal Space Program

When attaching parts, notably ~0.625m ones, via surface attachment on to a part, and then node attaching another surface attachable part onto aforementioned part, the following NRE spams the Debug Log:

NullReferenceException: Object reference not set to an instance of an object
  at EditorLogic.CheckSymPartsAttach (. oAttach) [0x00000] in <filename unknown>:0 

  at EditorLogic.UpdatePartMode () [0x00000] in <filename unknown>:0 

  at EditorLogic.Update () [0x00000] in <filename unknown>:0 

1. Go to either editor.
2. Select a root part, a pod does nicely.
3. Attach a surface attachable part to the pod (eg RTG, or small octagonal strut)
4. Attach another surface attachable part to said part.
5. Observe NREs in the Debug Log, these remain as long as the part is hovering over the other.

Notes
This appears to cease after a number of reproductions, with attempts to reproduce it failing. Restarting the game allows it to occur again. No issues seem to occur due to the NRE.