ERR: HORDE IMP is marked as authenticated, but no credentials can be found in the session.

Dear all,

using Horde Webmail on Ubuntu 16.04 with mariadb and php 5.6. Since
updating with apt-get upgrade I cannot use IMP anymore because I get the
following error:

IMP is marked as authenticated, but no credentials can be found in the
session.

The error log shows the following message:

ERR: HORDE [imp] IMP is marked as authenticated, but no credentials can be
found in the session. [pid 489 on line 628 of "/usr/local/share/horde/imp/
lib/Imap.php"]

IMP is version 6.2.17 and horde is 5.2.13

Any idea where I can start looking to solve the error message? Any help
would be appreciated.

Regards,
alex
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