cbb66c68f0
https://projects.blender.org/tracker/index.php?func=detail&aid=1843&group_id=9&atid=125 function find_basis_mball() sometimes returned duplicated MetaBall as basis mball, which caused crash of Blender. It happened only when basis MBall object was used for duplication. It was propably caused by some changes in duplicator code.