I wonder if this is the language nesting issue?

Attached is a more minimal example that gives the same error, which is
the following:

Runaway argument?
\let \AtEndDocument \@firstofone \@enddocumenthook \@checkend {docume\ETC.
! File ended while scanning use of \beamer@collect@@body.
<inserted text> 
<*> beamer.tex
I suspect you have forgotten a `}', causing me
to read past where you wanted me to stop.
I'll try to recover; but if the error is serious,
you'd better type `E' or `X' now and fix your file.

! Emergency stop.
<*> beamer.tex

Any ideas?

#LyX 2.3 created this file. For more info see http://www.lyx.org/
\lyxformat 512
\save_transient_properties true
\origin /systemlyxdir/examples/fr/
\textclass beamer
\use_default_options true
\maintain_unincluded_children false
\language french
\language_package default
\inputencoding auto
\fontencoding global
\font_roman "default" "FreeSans"
\font_sans "default" "FreeSans"
\font_typewriter "default" "FreeSans"
\font_math "auto" "auto"
\font_default_family default
\use_non_tex_fonts true
\font_sc false
\font_osf false
\font_sf_scale 100 100
\font_tt_scale 100 100
\use_microtype false
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\paperfontsize default
\spacing single
\use_hyperref false
\papersize default
\use_geometry true
\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 1
\use_package esint 1
\use_package mathdots 1
\use_package mathtools 1
\use_package mhchem 1
\use_package stackrel 1
\use_package stmaryrd 1
\use_package undertilde 1
\cite_engine basic
\cite_engine_type default
\biblio_style plain
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\justification true
\use_refstyle 1
\index Index
\shortcut idx
\color #008000
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\paragraph_indentation default
\quotes_language french
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false


\begin_layout Frame
\begin_inset Argument 4
status collapsed

\begin_layout Plain Layout
Un exemple



\begin_layout Frame
Soit par exemple une citation.
 Dans un environnement 
\begin_inset Flex Structure
status collapsed

\begin_layout Plain Layout


, vous pouvez spécifier les réglages de recouvrement via 
\begin_inset Flex Alert
status collapsed

\begin_layout Plain Layout
Insérer\SpecialChar menuseparator
Spécifications de recouvrement


 Si vous les faites et saisissez 
\begin_inset Quotes fld

\begin_inset Quotes frd

, la citation n’apparaîtra que sur la (sous-)diapo 2:

\begin_layout Quote
\begin_inset Argument 1
status collapsed

\begin_layout Plain Layout


\lang english
Fear no more the heat o’ the sun

\begin_layout Quote

\lang english
Nor the furious winter’s rages

\begin_layout Quote

\lang english
Thou thy worldly task hast done

\begin_layout Quote

\lang english
Home art gone, and ta’en thy wages

\begin_layout Frame
Voilà comment fonctionne le concept, fondamentalement


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