crash after running notmuch new

[Matt <mattator@gmail.com>]

hi,

I have a script that runs mbsync followed by notmuch new.
It ends with `terminate called after throwing an instance of
'Xapian::DatabaseCorruptError`.

Any idea what could cause this. Here is a trace without symbols thoug
====
#0  0x00007f1cb90d315a in raise () from
/nix/store/9rabxvqbv0vgjmydiv59wkz768b5fmbc-glibc-2.30/lib/libc.so.6
#1  0x00007f1cb90bd548 in abort () from
/nix/store/9rabxvqbv0vgjmydiv59wkz768b5fmbc-glibc-2.30/lib/libc.so.6
#2  0x00007f1cb8d3e643 in ?? () from
/nix/store/lzyjivyzrp6agilxhgh0h40pwwg18agy-gcc-9.2.0-lib/lib/libstdc++.so.6
#3  0x00007f1cb8d4a066 in ?? () from
/nix/store/lzyjivyzrp6agilxhgh0h40pwwg18agy-gcc-9.2.0-lib/lib/libstdc++.so.6
#4  0x00007f1cb8d4a0b1 in std::terminate() () from
/nix/store/lzyjivyzrp6agilxhgh0h40pwwg18agy-gcc-9.2.0-lib/lib/libstdc++.so.6
#5  0x00007f1cb8d4a336 in __cxa_rethrow () from
/nix/store/lzyjivyzrp6agilxhgh0h40pwwg18agy-gcc-9.2.0-lib/lib/libstdc++.so.6
#6  0x00007f1cb8ec1f08 in
Xapian::TermIterator::TermIterator(Xapian::TermIterator::Internal*)
[clone .cold] ()
   from /nix/store/5afyzmgp6rsn1digmh1hf47g7ppwp25v-xapian-1.4.15/lib/libxapian.so.30
#7  0x00007f1cb8ef9546 in
Xapian::Database::allterms_begin(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) const () from
/nix/store/5afyzmgp6rsn1digmh1hf47g7ppwp25v-xapian-1.4.15/lib/libxapian.so.30
#8  0x00007f1cb94a81bf in
_create_filenames_for_terms_with_prefix(void*, _notmuch_database*,
char const*) [clone .isra.0] ()
   from /nix/store/f4jm5j94pamm5xkbqrk1r70zjvjn0mch-notmuch-0.29.3/lib/libnotmuch.so.5
#9  0x00007f1cb94a8395 in notmuch_directory_get_child_directories ()
   from /nix/store/f4jm5j94pamm5xkbqrk1r70zjvjn0mch-notmuch-0.29.3/lib/libnotmuch.so.5
#10 0x00000000004105df in add_files ()
#11 0x000000000040fe9e in add_files ()
#12 0x000000000040fe9e in add_files ()
#13 0x000000000040fe9e in add_files ()
#14 0x0000000000411693 in notmuch_new_command ()
===

Cheers