Hello, I am preparing a document with a publication list generated from BibTeX but I get the following error: ! LuaTeX error .../context/texmf-context/tex/context/base/bibl-tra.lua:83: attempt to compare nil with number stack traceback: .../context/texmf-context/tex/context/base/bibl-tra.lua:83: in function <.../context/texmf-context/tex/context/base/bibl-tra.lua:80> [C]: in function 'sort' .../context/texmf-context/tex/context/base/bibl-tra.lua:93: in function 'flush' <main ctx instance>:1: in main chunk. \typesetpubslist ...hacks.flush("\@@pbsorttype ")} \doendoflist \dodoplacepublications ...sttrue \typesetpubslist \inpublistfalse \endgroup ... <to be read again> Is there a way I can narrow down what and where the problem is? At the moment I'm stumped. I've tried removing some of the \cite commands recently added, but to no avail. Is the problem in the BibTeX file or in my document? Any help would be much appreciated. Regards, Richard Converteam UK Ltd. Registration Number: 5571739 and Converteam Ltd. Registration Number: 2416188 Registered in England and Wales. Registered office: Boughton Road, Rugby, Warwickshire, CV21 1BU. CONFIDENTIALITY : This e-mail and any attachments are confidential and may be privileged. If you are not a named recipient, please notify the sender immediately and do not disclose the contents to another person, use it for any purpose or store or copy the information in any medium. http://www.converteam.com Please consider the environment before printing this e-mail.