Crash with a new model in a session

$ texts session 
Input > %hist

Input > a = 1
Input > %uuid
uuids: 2433a99210a14915aa4be9fdddc70d49 ('2433a99210a14915aa4be9fdddc70d49')
Input > %exit
Exiting
(python-3.10.12) vanjo@cubi:~/work/vre-language$ texts session -u 2433a99210a14915aa4be9fdddc70d49
Input > %hist
WAITING    2024-07-07T09:32:49+02:00 a = 1
Input > %uuid
uuids: 2433a99210a14915aa4be9fdddc70d49 ('2433a99210a14915aa4be9fdddc70d49')
Input > %new
Traceback (most recent call last):
  File "vre-language/src/virtmat/language/utilities/errors.py", line 285, in wrapper
    return func(*args, **kwargs)
  File "vre-language/src/virtmat/language/cli/run_session.py", line 87, in main
    mgr.main_loop()
  File "vre-language/src/virtmat/language/interpreter/session_manager.py", line 600, in main_loop
    self.session = Session(self.lpad, create_new=True,
  File "vre-language/src/virtmat/language/interpreter/session_manager.py", line 101, in __init__
    raise ValueError(msg)
ValueError: grammar must be provided if uuid not provided

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

Traceback (most recent call last):
  File "python-3.10.12/bin/texts", line 8, in <module>
    sys.exit(texts())
  File "vre-language/src/virtmat/language/cli/__init__.py", line 25, in texts
    clargs.func(clargs)
  File "vre-language/src/virtmat/language/utilities/errors.py", line 314, in wrapper
    raise RuntimeError('non-handled exception') from err
RuntimeError: non-handled exception