Arithmetic overflow when using \section within backup slides

[johan12345]

I tried to use \section* to create a new section for my backup slides.

\documentclass{beamer}

\usetheme[progressbar=frametitle]{metropolis}
\usepackage{appendixnumberbeamer}

\begin{document}

\begin{frame}{A}
A
\end{frame}

\appendix

\section*{Backup slides}
\begin{frame}{B}
B
\end{frame}

\end{document}

However, the compilation fails with

! Arithmetic overflow.
<recently read> \calc@denominator 
                                  
l.14 \section{Backup slides}

This may be related to #15, #18, but is not fixed in the latest version 2017/01/23 v1.2.

[FractalArt]

I am experiencing the same problem using \section{} after a complete re-installation of Ubuntu (changing nothing in the LaTeX source files). Before that it worked, now I am getting exactly the same error.

[pieterlexis]

This happens to me as well on texlive-core 2019.52579-1.

Using a \section*{} after \appendix with appendixnumberbeamer loaded produces this error.

Either changing to \section{} or removing the \usepackage{appendixnumberbeamer} fixes the error.

[FractalArt]

Thanks a lot, that also works for me.

[a3nm]

This happens to me as well, in a treacherous way because the \section* in question was added by natbib.