# Biblatex - Undefined control sequence with specific source [duplicate]

As soon as I try to cite a specific source, the bibliography causes an "Undefined control sequence" error. When I cite a different source, no problems occur.

A minimal working example:

\documentclass[]{scrbook}
\usepackage[style=chem-angew, backend=bibtex, sorting=none]{biblatex} % chem-angew
\begin{document}
\cite{Maitlis.2013a}
\printbibliography
\end{document}


The specific entry from the bib-file:

@Book{Maitlis.2013a,
title =     {Greener Fischer-Tropsch Processes for Fuels and Feedstocks},
date =      {2013},
editor =    {Maitlis, Peter M. and de Klerk, A.},
publisher = {WILEY-VCH Verlag},
location =  {Weinheim},
file =      {Maitlis.2013a.pdf:Books\\Maitlis.2013a.pdf:PDF},
keywords =  {Fischer-Tropsch}
}


This is the output from the log-file:

! Undefined control sequence.
<argument> ...ibnameprefix {de}\isdot \ifprefchar
{} {} {\ifuseprefix {\bibn...
l.10


I have no idea how to solve this issue? Have I missed something? Thank you for your help!

## marked as duplicate by Andrew Swann, Community♦Feb 11 '16 at 17:08

I would post it as a comment but I don't have enough reputation. What I've seen is that if you change the backend to biber (from bibtek) you don't get any error. This code in fact compiles:

\documentclass[]{scrbook}

\usepackage[style=chem-angew, backend=biber, sorting=none]{biblatex} % chem-angew

\begin{document}
\cite{Maitlis.2013a}
\printbibliography
\end{document}


If you don't need bibtex as a backend I would suggest to go with biber (also suggested by sharelatex).

• Unfortunately I cannot go with biber, as the group policy on the computer I am working on, prohibits me from running an external program. And as biber is called from some temporary cache folder, it is not working. – Dieter Feb 11 '16 at 16:20
• @Dieter: You can try to set an environment variable which will tell biber to unpack itself in some other folder: github.com/plk/biber/issues/70 – Ulrike Fischer Feb 11 '16 at 16:42

I think your problem is the same that this post. It comes from the name.

Bug: biblatex can not deal name prefix like "van der ", Miktex updated on 2016.01.16

(I also not have enough reputation to comment, sorry)