verified on 3.5.8 (mom-0.4.1-4.el6ev.noarch) verification steps: 1. create a pool of 15 VMs 2. migrate all the 15 VMs 3. check in mom logs to be sure, i repeated this steps several times. i didn't see this exception.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-0317.html