dovecot - May 2015 - Segfault on "doveadm sync -u <an-specific-user> tcp:<other-node-ip>:port"

Hi!

When I run "doveadm sync -u <an-specific-user>
tcp:192.168.0.2:12345", I
get this error:
http://pastebin.com/NxyyNGJk

Only to one specific user... I've tried to repair with "doveadm 
force-resync", unsuccessfully. Is this known?

Ubuntu14.04 + Dovecot-2.2.15. My doveconf -n:
http://pastebin.com/25sURwJL

Thanks!
--
Thiago Henrique