I've tested in 16.11, 17.11 and on master and Code39+Module43 and Code39+Modulo10 are not printing for me, while just Code39 works fine. When exporting, the PDF is not created, instead a yellow error message is shown: WARNING: Error while creating PDF file. Batch: 1 Layout: 22 Template: 26 Please have your system administrator check the error log for details. koha-plack-err does show a lot of those: CGI::param called in list context from package Template::Document line 20, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436. CGI::param called in list context from package Template::Document line 13, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436. CGI::param called in list context from package Template::Document line 14, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436. I've tested with the sample patrons, who have numerical cardnumbers like: Pamela Bennett, 23529000318858