django.db.utils.IntegrityError: UNIQUE constraint failed: core_snapshot.timestamp

[i] [2020-07-31 17:34:44] ArchiveBox v0.4.9: archivebox init
    > /.archivebox-output/archive-working
[*] Updating existing ArchiveBox collection in this folder...
    /.archivebox-output/archive-working
------------------------------------------------------------------
[*] Verifying archive folder structure...
    √ /.archivebox-output/archive-working/sources
    √ /.archivebox-output/archive-working/archive
    √ /.archivebox-output/archive-working/logs
    √ /.archivebox-output/archive-working/ArchiveBox.conf
[*] Verifying main SQL index and running migrations...
    √ /.archivebox-output/archive-working/index.sqlite3
    Operations to perform:
      Apply all migrations: admin, auth, contenttypes, core, sessions
    Running migrations:
    Applying core.0005_auto_20200728_0326... OK
[*] Collecting links from any existing indexes and archive folders...
    √ Loaded 1376 links from existing main index.
    √ Added 347 orphaned links from existing archive directories.
    ! Skipped adding 239 invalid link data directories.
    X /* SNIP A BUNCH OF BROKEN ARCHIVES /*
    Hint: For more information about the link data directories that were skipped, run:
        archivebox status
        archivebox list --status=invalid
[*] [2020-07-31 18:01:50] Writing 1723 links to main index...
Traceback (most recent call last):
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/query.py", line 575, in update_or_create
    obj = self.select_for_update().get(**kwargs)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/query.py", line 417, in get
    self.model._meta.object_name
core.models.DoesNotExist: Snapshot matching query does not exist.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/backends/utils.py", line 86, in _execute
    return self.cursor.execute(sql, params)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/backends/sqlite3/base.py", line 396, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.IntegrityError: UNIQUE constraint failed: core_snapshot.timestamp
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/home/USERNAME/.local/bin/archivebox", line 33, in <module>
    sys.exit(load_entry_point('archivebox', 'console_scripts', 'archivebox')())
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/cli/__init__.py", line 126, in main
    pwd=pwd or OUTPUT_DIR,
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/cli/__init__.py", line 62, in run_subcommand
    module.main(args=subcommand_args, stdin=stdin, pwd=pwd)    # type: ignore
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/cli/archivebox_init.py", line 35, in main
    out_dir=pwd or OUTPUT_DIR,
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/util.py", line 109, in typechecked_function
    return func(*args, **kwargs)
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/main.py", line 369, in init
    write_main_index(list(all_links.values()), out_dir=out_dir)
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/util.py", line 109, in typechecked_function
    return func(*args, **kwargs)
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/index/__init__.py", line 235, in write_main_index
    write_sql_main_index(links, out_dir=out_dir)
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/util.py", line 109, in typechecked_function
    return func(*args, **kwargs)
  File "/home/USERNAME/datahoard/ArchiveBox/archivebox/index/sql.py", line 42, in write_sql_main_index
    Snapshot.objects.update_or_create(url=link.url, defaults=info)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/query.py", line 580, in update_or_create
    obj, created = self._create_object_from_params(kwargs, params, lock=True)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/query.py", line 604, in _create_object_from_params
    raise e
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/query.py", line 596, in _create_object_from_params
    obj = self.create(**params)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/query.py", line 433, in create
    obj.save(force_insert=True, using=self.db)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/base.py", line 746, in save
  force_update=force_update, update_fields=update_fields)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/base.py", line 784, in save_base
    force_update, using, update_fields,
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/base.py", line 887, in _save_table
    results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/base.py", line 926, in _do_insert
    using=using, raw=raw,
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/query.py", line 1204, in _insert
    return query.get_compiler(using=using).execute_sql(returning_fields)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1392, in execute_sql
    cursor.execute(sql, params)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/backends/utils.py", line 68, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/backends/utils.py", line 86, in _execute
    return self.cursor.execute(sql, params)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/backends/utils.py", line 86, in _execute
    return self.cursor.execute(sql, params)
  File "/home/USERNAME/.local/lib/python3.7/site-packages/django/db/backends/sqlite3/base.py", line 396, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: UNIQUE constraint failed: core_snapshot.timestamp