I’m using the listings package for Latex to insert a python code snippet inside a beamer. Here’s the (although reduced to the bare minimum for the bug to happen) code :

documentclass{beamer}
usepackage{graphicx, listings, tikz, subcaption, amsmath} 
usetheme{Copenhagen}
setbeamertemplate{footline}[frame number]


begin{document}

maketitle

begin{frame}{My frame}
    begin{lstlisting}
        Why 
            doesn't 
        this work ??
    end{lstlisting}
end{frame}

end{document}

The result is a compilation timeout, and I don’t get why. I’m using Overleaf, by the way.

Thanks !