Footnote in section: Compilation stops on TUO file

[Henning Hraban Ramm <hraban@fiee.net>]

I don't understand this error:

(/usr/local/texlive/2007/../texmf-local/tex/context/base/spec-tst.tex) 
interaction     : active(./prd_05.tuo) (./prd_05.tuo! Improper  
alphabetic constant.<to be read again>                    \footnote  
<argument> \ifnum `\footnote                              =255 32 
\else `\footnote \fi \utfdiv #1->\the \numexpr \ifcase \numexpr  
#1                                             \relax 0\else (#1- 
\utf@g )/\utf...
\PDFunicodechar ...bers \@EA {\number \utfdiv  
{#1}                                                  }\@EA  
\lchexnumbers \@EA {...
\nodoPDFuni ...ar {\ifnum `#1=255 32\else `#1 
\fi }                                                  \doPDFuni  
\bookmarktext ...-?und?Erziehungsauftrag 
\footnote                                                   {H.?P.,? 
Humanist?R......l.176 ...ion for Europe}{2--0-7-0-0-0-0-0--49} 
{50}                                                  %? eNo pages of  
output.

It seems to be caused by this line, i.e. by the footnote:

\section{Bildungs- und Erziehungsauftrag\footnote{H. P., Humanist  
Road to European Citizenship, Zitate aus Verfassungen, 15.\,12.\,2007}}

And in the TUO file there's:

\mainreference{}{fnt:t:5}{2--0-6-5-0-0-0-0--45}{46}{}%\pospxywhd{text: 
47}{47}{42.67912pt}{62.59607pt}{327.20668pt}{489.38742pt}{0.0pt}% 
\listentry{subsection}{76}{}{Baden-Württemberg}{2--0-6-6-16-0-0-0--46} 
{47}%\listentry{subsection}{77}{}{Bayern}{2--0-6-6-17-0-0-0--46}{47}% 
\listentry{subsection}{78}{}{Brandenburg}{2--0-6-6-18-0-0-0--46}{47}% 
\listentry{subsection}{79}{}{Berlin}{2--0-6-6-19-0-0-0--46}{47}% 
\listentry{subsection}{80}{}{Bremen}{2--0-6-6-20-0-0-0--46}{47}% 
\listentry{section}{81}{}{Bildungs- und Erziehungsauftrag\footnote  
{H. P., Humanist Road to European Citizenship, Zitate aus  
Verfassungen, 15.\,12.\,2007}}{2--0-6-7-0-0-0-0--46}{47}% 
\mainreference{}{fnt:f:6}{2--0-6-7-0-0-0-0--46}{47}{}%\listentry 
{subsection}{115}{}{Hessen}{2--0-6-7-34-0-0-0--46}{47}%\listentry 
{subsection}{116}{}{Mecklenburg-Vorpommern}{2--0-6-7-35-0-0-0--46} 
{47}%\listentry{subsection}{117}{}{Niedersachsen} 
{2--0-6-7-36-0-0-0--46}{47}%

What's wrong?

Greetlings from Lake Constance!
Hraban
---
http://www.fiee.net
https://www.cacert.org (I'm an assurer)


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