Hi While experiencing high CPU load on a virtual machine installed with Koha 18.11.03 I found hundreds and thousands of lines like the following in file "/var/log/koha/skat/plack-error.log": C4::Context->userenv not defined! at /usr/share/koha/lib/C4/Items.pm line 1037. C4::Context->userenv not defined! at /usr/share/koha/lib/C4/Items.pm line 1037. C4::Context->userenv not defined! at /usr/share/koha/lib/C4/Items.pm line 1037. It seems like every OPAC search (executed by some annoying webcrawlers) does generate such aline which unfortunately even comes without a timestamp. Currently the file "plack-error.log" has around 262'000 lines and 260'000 of them look like shown above. In and old message ( https://lists.katipo.co.nz/public/koha/2015-October/044027.html ) Mark Tompsett wrote, these are just warnings. "If you had opac logins enabled, and you logged in, you would find that these messages would not be triggered." OPAC logins are allowed by system preference "opacuserlogin" but still these messages do appear. How can I get rid of this endlessly repeated message? Best wishes: Michael -- Geschäftsführer · Diplombibliothekar BBS, Informatiker eidg. Fachausweis Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz T 0041 (0)61 261 55 61 · E mik@adminkuhn.ch · W www.adminkuhn.ch