Duplicate key error v registraci

psycopg2.errors.UniqueViolation: duplicate key value violates unique constraint "users_email_key"
DETAIL:  Key (email)=(lenka.pospisilova@sestka-fm.cz) already exists.


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/flask/app.py", line 2525, in wsgi_app
    response = self.full_dispatch_request()
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/flask/app.py", line 1822, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/flask/app.py", line 1820, in full_dispatch_request
    rv = self.dispatch_request()
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/flask/app.py", line 1796, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/mo/web/acct.py", line 620, in confirm_email
    reg2.change_email()
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/mo/web/acct.py", line 545, in change_email
    sess.commit()
  File "<string>", line 2, in commit
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 1451, in commit
    self._transaction.commit(_to_root=self.future)
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 829, in commit
    self._prepare_impl()
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 808, in _prepare_impl
    self.session.flush()
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 3383, in flush
    self._flush(objects)
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 3523, in _flush
    transaction.rollback(_capture_exception=True)
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/util/langhelpers.py", line 70, in __exit__
    compat.raise_(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/util/compat.py", line 208, in raise_
    raise exception
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 3483, in _flush
    flush_context.execute()
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/unitofwork.py", line 456, in execute
    rec.execute(self)
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/unitofwork.py", line 630, in execute
    util.preloaded.orm_persistence.save_obj(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/persistence.py", line 237, in save_obj
    _emit_update_statements(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/orm/persistence.py", line 1001, in _emit_update_statements
    c = connection._execute_20(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1705, in _execute_20
    return meth(self, args_10style, kwargs_10style, execution_options)
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/sql/elements.py", line 333, in _execute_on_connection
    return connection._execute_clauseelement(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1572, in _execute_clauseelement
    ret = self._execute_context(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1943, in _execute_context
    self._handle_dbapi_exception(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 2124, in _handle_dbapi_exception
    util.raise_(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/util/compat.py", line 208, in raise_
    raise exception
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1900, in _execute_context
    self.dialect.do_execute(
  File "/aux/akce/mo/osmo/venv/lib/python3.9/site-packages/sqlalchemy/engine/default.py", line 732, in do_execute
    cursor.execute(statement, parameters)
sqlalchemy.exc.IntegrityError: (psycopg2.errors.UniqueViolation) duplicate key value violates unique constraint "users_email_key"
DETAIL:  Key (email)=(lenka.pospisilova@sestka-fm.cz) already exists.

[SQL: UPDATE users SET email=%(email)s WHERE users.user_id = %(users_user_id)s]
[parameters: {'email': 'lenka.pospisilova@sestka-fm.cz', 'users_user_id': 24648}]
(Background on this error at: https://sqlalche.me/e/14/gkpj)
2022-11-29 11:26:27 86.63.223.87 POST "/acct/confirm/e?token=1669717565:a86eea2fcd5044128645a4ce91faf137:d4921037e6415c1a" HTTP/1.1 500 t=190 rxb=129 txb=265 pid=62587 user=24648