mkiv: 'extras' option in cite command = error

mkiv: 'extras' option in cite command = error

[Christian]

Hello,
when using the extras options, context hangs at:
publications    > loading database from example.bbl
(example.bbl)
...and then aborts with an error.

Example files:

<---example.bib--->
@BOOK{Eijkhout1991,
  title = {\TeX\ by Topic. A \TeX nician's Reference},
  publisher = {Addison-Wesley},
  year = {1991},
  author = {Victor Eijkhout},
  address = {London},
  keywords = {general},
}
<---EOF--->

<---example.mkiv--->
\setupbibtex[database=example]
\setuppublications[alternative=apa,refcommand=data]
\setupinteraction[state=start]
\starttext
Let's test adding specific page numbers in the cite command\footnote{\cite[extras={, page 12}][Eijkhout1991]}
\page
\placepublications[criterium=all]
\stoptext
<---EOF--->

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