There seems to be bug in ACP - Prune users component.
I selected to delete all users that are registered before : 2014-10-01 and their posts are equal to 0.
This showed me also users that have posts.. this does not make sense.

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  There is probably some issue with condition equal to 0 because if I select less than 1 -> it works ok.
  Thanks in advance for having a look at it.