Language-specific bibliography (biblatex): \language@active@arg" has an extra }

Question

I get these warnings:

! Argument of \language@active@arg" has an extra }. <inserted text> \par l.8 prenote=presecondary, postnote=postsecondary]

! Paragraph ended before \language@active@arg" was complete. <to be read again> \par l.8 prenote=presecondary, postnote=postsecondary]

I suppose the problem is something concerning the language settings of my document, especially those of the bibfile. I already read Language settings in bibliography and How does langid field in biblatex differ from language field? but it didn't help me. Deleting the aux-file didn't change anything. The error occured since I included some new bib-files (formatted like the example below). One problem may be that I'm quite confused with these language options. But even deleting the language fields did not change anything!

So here is an MWE:

\documentclass{scrbook}
\usepackage{lipsum}
\usepackage[french, english, italian, ngerman]{babel}
\usepackage[autostyle=true, french=guillemets, english=american, german=quotes]{csquotes}
\usepackage[style=authoryear-comp, url=true, doi=true, isbn=true, eprint=true, dashed=false, 
backend=biber, sorting=nyt, maxbibnames=3, giveninits=false, clearlang=true, language=auto, 
autolang=other]{biblatex}
\addbibresource{DissBib.bib}
\begin{document}
\lipsum
\nocite{*}
\printbibliography[heading=subbibliography, title={Textausgaben, Übersetzungen, Kommentare}, prenote=preprimary, postnote=postprimary, filter=bwbibsort]
\printbibliography[heading=subbibliography, title={Sekundärliteratur}, keyword=bwSek, prenote=presecondary, postnote=postsecondary]
\end{document}

And here is the bib-file I used:

@collection{Amberger.2017,
 year = {2017},
 title = {Auf Utopias Spuren. Utopie und Utopieforschung. Festschrift f{\"u}r Richard Saage zum 75. Geburtstag},
 keywords = {bwSek},
 location = {Wiesbaden},
 publisher = {{Springer VS}},
 isbn = {978-3-658-14045-8},
 editor = {Amberger, Alexander and M{\"o}bius, Thomas and Saage, Richard},
 doi = {10.1007/978-3-658-14045-8},
 shorthand = {Amberger/M{\"o}bius/Saage 2017},
 language = {de},
 langid = {ngerman}
}
@incollection{Nitschke.2017,
 crossref = {Amberger.2017},
 author = {Nitschke, Peter},
 title = {Die kritische Referenz der Utopie, oder Wie sinnvoll ist die Abgrenzung zum Chiliasmus},
 keywords = {bwSek},
 pages = {161--174},
 publisher = {{Springer VS}},
 isbn = {978-3-658-14045-8},
 editor = {Amberger, Alexander and M{"o}bius, Thomas and Saage, Richard},
 booktitle = {Auf Utopias Spuren. Utopie und Utopieforschung. Festschrift f{"u}r Richard Saage zum 75. Geburtstag},
 location = {Wiesbaden},
 language = {de},
 keywords = {bwSek},
 shorthand = {Nitschke 2017},
 langid = {ngerman}
}

Thanks for your help.