guam crashes since update to version guam-0.9.4-16.7.el7.kolab_16.x86_64 and two users can no longer connect via imap if I switch back to the guam-0.9.4-15.3.el7.kolab_16.x86_64.rpm there are no crashes and the users can connect again.
Both users have folders in schema year number e.g. "2018" on the top level of their imap folder structure if I remove these folders both users can connect to imap and guam does not crash.
2019-05-10 08:49:12.276 [error] <0.2812.0> gen_server <0.2812.0> terminated with reason: bad argument in call to binary:match(2018, <<"Calendar/">>) in kolab_guam_rule_filter_groupware:in_blacklist/2 line 149 2019-05-10 08:49:12.277 [error] <0.2812.0> CRASH REPORT Process <0.2812.0> with 0 neighbours exited with reason: bad argument in call to binary:match(2018, <<"Calendar/">>) in kolab_guam_rule_filter_groupware:in_blacklist/2 line 149 kolab list-mailbox-metadata user/user/2018@gcd-pl.de Folder user/user/2018@gcd-pl.de /shared/vendor/cmu/cyrus-imapd/partition default /shared/vendor/cmu/cyrus-imapd/lastupdate 3-May-2019 11:12:54 +0200 /shared/vendor/cmu/cyrus-imapd/duplicatedeliver false /shared/vendor/cmu/cyrus-imapd/pop3newuidl true /shared/vendor/cmu/cyrus-imapd/size 3209673 /shared/vendor/cmu/cyrus-imapd/sharedseen false /shared/vendor/cmu/cyrus-imapd/uniqueid 082a3ac4-27ac-4ade-8ae5-3876c71b30a0