Problems with pdf bookmarks and hyperref since recent updates

[Krotzkack]

Hi all,

Since one of the recent updates I get some problems with pdf bookmarks
and hyperref. Here is a minimal example:

\documentclass{scrreport}

\usepackage{polyglossia}
\setdefaultlanguage{english}
\usepackage{fontspec}
\usepackage{amsmath}


\usepackage[%
  hyperfootnotes=false,%
  pdfpagelabels,%
  unicode,
  psdextra,
  unicode=true
  % pdfa,%
]{hyperref}

\begin{document}

\section{Math like $\kappa$ is not fine here}
$\kappa$ is fine here.
test test.
\end{document}


The errors look like this:
 ! Undefined control sequence.
 \@currenttocentry ->Math like $\kappa

or

! Undefined control sequence.
\bookmark at text ...fi