ActiveSync PHP errors after upgrade

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Since upgrading Horde with PEAR to the latest available earlier this
week, I'm seeing a bunch of error messages in syslog of the form:

HORDE: PHP ERROR: implode(): Invalid arguments passed [pid 27975 on
line 493 of "/usr/share/pear/Horde/ActiveSync/State/Sql.php"].

I have ActiveSync logging enabled for the domain in question, but I'm
not seeing any matching errors in the per-device logs, so I'm not sure
how worried to be.

Some quick searching hasn't turned up anything.

Environment is CentOS 6 with Webtatic PHP 5.6 packages installed;
PostgreSQL database.

Horde Groupware Webmail edition 5.2.22
IMP version 6.2.22
Horde_ActiveSync version 2.39.4

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Nels Lindquist
<[email protected]>
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