I get this error with Aegir hosting system, when trying to move a website to another platform (drupal core update).
A simple if ($status && is_object($object)) { in expire_execute_expiration() solves the problem for me.

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anthonyleach’s picture

Status: Needs review » Closed (cannot reproduce)

This problem had been resolved in commit #f724c07 on the 5th December 2014.