Exception in `/bookmarks`

Run command /bookmarks

See in error.log

2021-10-03 13:53:52,096 ERROR:base_events:Exception in callback Core.on_input_readable()
handle: <Handle Core.on_input_readable()>
Traceback (most recent call last):
  File "/usr/lib/python3.9/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/home/zash/src/poezio/poezio/core/core.py", line 672, in on_input_readable
    self.do_command(replace_line_breaks(char), False)
  File "/home/zash/src/poezio/poezio/core/core.py", line 829, in do_command
    self.tabs.current_tab.on_input(key, raw)
  File "/home/zash/src/poezio/poezio/tabs/rostertab.py", line 874, in on_input
    res = self.input.do_command(key, raw=raw)
  File "/home/zash/src/poezio/poezio/windows/inputs.py", line 751, in do_command
    res = Input.do_command(self, key, reset=reset, raw=raw)
  File "/home/zash/src/poezio/poezio/windows/inputs.py", line 457, in do_command
    res = self.key_func[key]()
  File "/home/zash/src/poezio/poezio/windows/inputs.py", line 776, in success
    res = self.on_success(self.get_text())
  File "/home/zash/src/poezio/poezio/tabs/rostertab.py", line 918, in execute_slash_command
    self.execute_command(txt)
  File "/home/zash/src/poezio/poezio/tabs/basetabs.py", line 356, in execute_command
    func(arg)
  File "/home/zash/src/poezio/poezio/decorators.py", line 41, in wrap
    result = func(*args, **kwargs)
  File "/home/zash/src/poezio/poezio/core/commands.py", line 581, in bookmarks
    tab = tabs.BookmarksTab(self.core, self.core.bookmarks)
  File "/home/zash/src/poezio/poezio/tabs/bookmarkstab.py", line 38, in __init__
    self.bookmarks_win = windows.BookmarksWin(self.bookmarks)
  File "/home/zash/src/poezio/poezio/windows/bookmark_forms.py", line 175, in __init__
    BookmarkJIDInput(bookmark),
  File "/home/zash/src/poezio/poezio/windows/bookmark_forms.py", line 41, in __init__
    jid.resource = field.nick or ''
  File "/home/zash/src/poezio/poezio-venv/src/slixmpp/slixmpp/jid.py", line 390, in resource
    self._resource = _validate_resource(value)
  File "/home/zash/src/poezio/poezio-venv/src/slixmpp/slixmpp/jid.py", line 170, in _validate_resource
    raise InvalidJID('Resource must not be 0 bytes')
slixmpp.jid.InvalidJID: Resource must not be 0 bytes

Apparently I have one(!) bookmark in the XEP-0048 bookmarks store without a <nick>Zash</nick>

poezio built from git with ./update.sh on Debian 11