samba - Aug 2023 - Crash on "samba-tool domain level raise --domain-level=2016 --forest-level=2016"

Hi, today I updated my DC debian 12 to samba 4.19rc2 from mjt repository 
and I tried to increase feature level of domain but failed.

First 2 commands was ok:

samba-tool domain schemaupgrade --schema=2019
samba-tool domain functionalprep --function-level=2016

the third instead failed:
> samba-tool domain level raise --domain-level=2016 --forest-level=2016
> ERROR(<class 'AttributeError'>): uncaught exception -
'NoneType'
> object has no attribute 'startswith'
> ? File "/usr/lib/python3/dist-packages/samba/netcmd/__init__.py",
line
> 279, in _run
> ??? return self.run(*args, **kwargs)
> ?????????? ^^^^^^^^^^^^^^^^^^^^^^^^^
> ? File
"/usr/lib/python3/dist-packages/samba/netcmd/domain/level.py",
> line 72, in run
> ??? if subcommand == "raise" and not
H.startswith("ldap"):
> ???????????????????????????????????? ^^^^^^^^^^^^
I tried with to take more information with gdb but failed:

gdb --args /usr/bin/python3 /usr/bin/samba-tool domain level raise 
--domain-level=2016 --forest-level=2016
> (gdb) run
> Starting program: /usr/bin/python3 /usr/bin/samba-tool domain level 
> raise --domain-level=2016 --forest-level=2016
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library
"/lib/x86_64-linux-gnu/libthread_db.so.1".
> ERROR(<class 'AttributeError'>): uncaught exception -
'NoneType'
> object has no attribute 'startswith'
> ? File "/usr/lib/python3/dist-packages/samba/netcmd/__init__.py",
line
> 279, in _run
> ??? return self.run(*args, **kwargs)
> ?????????? ^^^^^^^^^^^^^^^^^^^^^^^^^
> ? File
"/usr/lib/python3/dist-packages/samba/netcmd/domain/level.py",
> line 72, in run
> ??? if subcommand == "raise" and not
H.startswith("ldap"):
> ???????????????????????????????????? ^^^^^^^^^^^^
> [Inferior 1 (process 14932) exited with code 0377]
> (gdb) bt full
> No stack.
If you need more information and I did it wrong? can you tell me what I 
need to do please?

Thanks for any reply and sorry for my bad english


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> the third instead failed:
>
>> samba-tool domain level raise --domain-level=2016 --forest-level=2016
>> ERROR(<class 'AttributeError'>): uncaught exception -
'NoneType'
>> object has no attribute 'startswith'
>> ? File
"/usr/lib/python3/dist-packages/samba/netcmd/__init__.py",
>> line 279, in _run
>> ??? return self.run(*args, **kwargs)
>> ?????????? ^^^^^^^^^^^^^^^^^^^^^^^^^
>> ? File
"/usr/lib/python3/dist-packages/samba/netcmd/domain/level.py",
>> line 72, in run
>> ??? if subcommand == "raise" and not
H.startswith("ldap"):
>> ???????????????????????????????????? ^^^^^^^^^^^^
> I tried with to take more information with gdb but failed:
>
> gdb --args /usr/bin/python3 /usr/bin/samba-tool domain level raise 
> --domain-level=2016 --forest-level=2016
>
>> (gdb) run
>> Starting program: /usr/bin/python3 /usr/bin/samba-tool domain level 
>> raise --domain-level=2016 --forest-level=2016
>> [Thread debugging using libthread_db enabled]
>> Using host libthread_db library 
>> "/lib/x86_64-linux-gnu/libthread_db.so.1".
>> ERROR(<class 'AttributeError'>): uncaught exception -
'NoneType'
>> object has no attribute 'startswith'
>> ? File
"/usr/lib/python3/dist-packages/samba/netcmd/__init__.py",
>> line 279, in _run
>> ??? return self.run(*args, **kwargs)
>> ?????????? ^^^^^^^^^^^^^^^^^^^^^^^^^
>> ? File
"/usr/lib/python3/dist-packages/samba/netcmd/domain/level.py",
>> line 72, in run
>> ??? if subcommand == "raise" and not
H.startswith("ldap"):
>> ???????????????????????????????????? ^^^^^^^^^^^^
>> [Inferior 1 (process 14932) exited with code 0377]
>> (gdb) bt full
>> No stack.
> If you need more information and I did it wrong? can you tell me what 
> I need to do please?
>
> Thanks for any reply and sorry for my bad english
Have you tried doing it step by step: first raise domain level and after 
that raising the forest level?