#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007f1e55c34537 in __GI_abort () at abort.c:79
#2  0x00007f1e55c3440f in __assert_fail_base
    (fmt=0x7f1e3fe4773c "%s%s%s :%u : %s%s l'assertion « %s » a échoué.\n%n", assertion=0x7f1e54588d14 "index >= 0 && static_cast<sal_uInt32>(index) < static_cast<sal_uInt32>(getLength())", file=0x7f1e54585742 "/home/julien/lo/libreoffice/include/rtl/ustring.hxx", line=791, function=<optimized out>) at assert.c:92
#3  0x00007f1e55c43662 in __GI___assert_fail
    (assertion=0x7f1e54588d14 "index >= 0 && static_cast<sal_uInt32>(index) < static_cast<sal_uInt32>(getLength())", file=0x7f1e54585742 "/home/julien/lo/libreoffice/include/rtl/ustring.hxx", line=791, function=0x7f1e54588d68 "sal_Unicode rtl::OUString::operator[](sal_Int32) const") at assert.c:101
#4  0x00007f1e541c2084 in rtl::OUString::operator[](int) const (this=0x6f2c928, index=1) at include/rtl/ustring.hxx:791
#5  0x00007f1e54426a11 in SvxAutoCorrect::FnAddNonBrkSpace(SvxAutoCorrDoc&, rtl::OUString const&, int, o3tl::strong_int<unsigned short, LanguageTypeTag>, bool&) (this=0x6ece990, rDoc=
    ..., rTxt="a", nEndPos=1, eLang=..., io_bNbspRunNext=@0x7ffce2a292c7: false) at editeng/source/misc/svxacorr.cxx:670
#6  0x00007f1e38df4fef in SwAutoFormat::AutoCorrect(o3tl::strong_int<int, Tag_TextFrameIndex>) (this=0x7ffce2a29960, nPos=...) at sw/source/core/edit/autofmt.cxx:2191
#7  0x00007f1e38df5e0b in SwAutoFormat::BuildText() (this=0x7ffce2a29960) at sw/source/core/edit/autofmt.cxx:1469
#8  0x00007f1e38dfae71 in SwAutoFormat::SwAutoFormat(SwEditShell*, SvxSwAutoFormatFlags const&, SwNodeIndex const*, SwNodeIndex const*) (this=0x7ffce2a29960, pEdShell=
    0x714abd0, rFlags=..., pSttNd=0x0, pEndNd=0x0) at sw/source/core/edit/autofmt.cxx:2649
#9  0x00007f1e38dfb690 in SwEditShell::AutoFormat(SvxSwAutoFormatFlags const*) (this=0x714abd0, pAFlags=0x7ffce2a2b7a0) at sw/source/core/edit/autofmt.cxx:2740
#10 0x00007f1e39e00b0f in SwTextShell::Execute(SfxRequest&) (this=0x799d250, rReq=...) at sw/source/uibase/shells/textsh1.cxx:719
#11 0x00007f1e39df5b15 in SfxStubSwTextShellExecute(SfxShell*, SfxRequest&) (pShell=0x799d250, rReq=...) at workdir/SdiTarget/sw/sdi/swslots.hxx:3111
#12 0x00007f1e528ddd52 in SfxShell::CallExec(void (*)(SfxShell*, SfxRequest&), SfxRequest&) (this=0x799d250, pFunc=0x7f1e39df5af0 <SfxStubSwTextShellExecute(SfxShell*, SfxRequest&)>, rReq=...)
    at include/sfx2/shell.hxx:197
#13 0x00007f1e528c61f9 in SfxDispatcher::Call_Impl(SfxShell&, SfxSlot const&, SfxRequest&, bool) (this=0x713c9b0, rShell=..., rSlot=..., rReq=..., bRecord=true) at sfx2/source/control/dispatch.cxx:253
#14 0x00007f1e528c6a88 in SfxDispatcher::PostMsgHandler(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >) (this=0x713c9b0, pReq=std::unique_ptr<class SfxRequest> = {...})
    at sfx2/source/control/dispatch.cxx:990
#15 0x00007f1e528eb8a0 in std::__invoke_impl<void, void (SfxDispatcher::*&)(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >), SfxDispatcher*&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> > >(std::__invoke_memfun_deref, void (SfxDispatcher::*&)(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >), SfxDispatcher*&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >&&)
    (__f=
    @0x3cd1ce0: (void (SfxDispatcher::*)(class SfxDispatcher * const, class std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)) 0x7f1e528c6860 <SfxDispatcher::PostMsgHandler(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>, __t=@0x3cd1cf0: 0x713c9b0, __args=...) at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/invoke.h:73
#16 0x00007f1e528eb747 in std::__invoke<void (SfxDispatcher::*&)(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >), SfxDispatcher*&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> > >(void (SfxDispatcher::*&)(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >), SfxDispatcher*&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >&&) (__fn=
    @0x3cd1ce0: (void (SfxDispatcher::*)(class SfxDispatcher * const, class std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)) 0x7f1e528c6860 <SfxDispatcher::PostMsgHandler(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>, __args=@0x3cd1cf0: 0x713c9b0, __args=...) at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/invoke.h:95
#17 0x00007f1e528eb695 in std::_Bind<void (SfxDispatcher::*(SfxDispatcher*, std::_Placeholder<1>))(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>::__call<void, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >&&, 0ul, 1ul>(std::tuple<std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >&&>&&, std::_Index_tuple<0ul, 1ul>) (this=0x3cd1ce0, __args=...)
    at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/functional:416
#18 0x00007f1e528eb5f1 in std::_Bind<void (SfxDispatcher::*(SfxDispatcher*, std::_Placeholder<1>))(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>::operator()<std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >, void>(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >&&) (this=0x3cd1ce0, __args=...)
    at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/functional:499
#19 0x00007f1e528eb582 in std::__invoke_impl<void, std::_Bind<void (SfxDispatcher::*(SfxDispatcher*, std::_Placeholder<1>))(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> > >(std::__invoke_other, std::_Bind<void (SfxDispatcher::*(SfxDispatcher*, std::_Placeholder<1>))(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >&&) (__f=..., __args=...) at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/invoke.h:60
#20 0x00007f1e528eb512 in std::__invoke_r<void, std::_Bind<void (SfxDispatcher::*(SfxDispatcher*, std::_Placeholder<1>))(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> > >(std::_Bind<void (SfxDispatcher::*(SfxDispatcher*, std::_Placeholder<1>))(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >&&) (__fn=..., __args=...) at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/invoke.h:110
#21 0x00007f1e528eb1f2 in std::_Function_handler<void (std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >), std::_Bind<void (SfxDispatcher::*(SfxDispatcher*, std::_Placeholder<1>))(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)> >::_M_invoke(std::_Any_data const&, std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >&&) (__functor=..., __args=...)
    at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/std_function.h:291
#22 0x00007f1e52da959b in std::function<void (std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >)>::operator()(std::unique_ptr<SfxRequest, std::default_delete<SfxRequest> >) const
    (this=0x7138150, __args=std::unique_ptr<class SfxRequest> = {...}) at /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/std_function.h:622
#23 0x00007f1e52da93a1 in SfxHintPoster::DoEvent_Impl(void*) (this=0x7138140, pPostedHint=0x9783710) at sfx2/source/notify/hintpost.cxx:41
#24 0x00007f1e52da9320 in SfxHintPoster::LinkStubDoEvent_Impl(void*, void*) (instance=0x7138140, data=0x9783710) at sfx2/source/notify/hintpost.cxx:38
#25 0x00007f1e4d4da698 in Link<void*, void>::Call(void*) const (this=0x8d8cf38, data=0x9783710) at include/tools/link.hxx:111
--Type <RET> for more, q to quit, c to continue without paging--q
Quit
(gdb) frame 4
#4  0x00007f1e541c2084 in rtl::OUString::operator[] (this=0x6f2c928, index=1) at include/rtl/ustring.hxx:791
791	        assert(index >= 0 && static_cast<sal_uInt32>(index) < static_cast<sal_uInt32>(getLength()));
(gdb) p index
$1 = 1
(gdb) p getLength()
[Thread 0x7f1e3d0bc700 (LWP 14482) exited]
$2 = 1
(gdb) frame 5
#5  0x00007f1e54426a11 in SvxAutoCorrect::FnAddNonBrkSpace (this=0x6ece990, rDoc=..., rTxt="a", nEndPos=1, eLang=..., io_bNbspRunNext=@0x7ffce2a292c7: false) at editeng/source/misc/svxacorr.cxx:670
670	        sal_Unicode cChar = rTxt[ nEndPos ];
(gdb) p rTxt
$3 = "a"
(gdb) p nEndPos
$4 = 1