https://bugs.documentfoundation.org/show_bug.cgi?id=144650
--- Comment #7 from Kevin Suo <suokunl...@126.com> --- I tried to get a backtrace (on Linux), but failed. Instead, I get the following output in terminal: /usr/include/c++/11/debug/safe_iterator.h:330: In function: __gnu_debug::_Safe_iterator<_Iterator, _Sequence, _Category>& __gnu_debug::_Safe_iterator<_Iterator, _Sequence, _Category>::operator++() [with _Iterator = std::__detail::_Node_iterator<std::pair<SfxMedium* const, std::shared_ptr<{anonymous}::ReadOnlyMediumEntry> >, false, false>; _Sequence = std::__debug::unordered_map<SfxMedium*, std::shared_ptr<{anonymous}::ReadOnlyMediumEntry> >; _Category = std::forward_iterator_tag] Error: attempt to increment a singular iterator. Objects involved in the operation: iterator "this" @ 0x0x7f3467b48190 { type = std::__detail::_Node_iterator<std::pair<SfxMedium* const, std::shared_ptr<(anonymous namespace)::ReadOnlyMediumEntry> >, false, false> (mutable iterator); state = singular; references sequence with type 'std::__debug::unordered_map<SfxMedium*, std::shared_ptr<(anonymous namespace)::ReadOnlyMediumEntry>, std::hash<SfxMedium*>, std::equal_to<SfxMedium*>, std::allocator<std::pair<SfxMedium* const, std::shared_ptr<(anonymous namespace)::ReadOnlyMediumEntry> > > >' @ 0x0x7f3484bc56a0 } -- You are receiving this mail because: You are the assignee for the bug.