Error creating sequences "Unorderable types: NoneType() > int()"
When I try to create new sequence and strict sequences, I get
Traceback (most recent call last):
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/protocols/dispatcher.py", line 201, in _dispatch
result = rpc.result(meth(*c_args, **c_kwargs))
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/ir/sequence.py", line 193, in create
sequences = super(Sequence, cls).create(vlist)
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/model/modelsql.py", line 595, in create
field.set(cls, fname, *fargs)
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/model/fields/function.py", line 109, in set
setter(Model.browse(ids), name, value)
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/ir/sequence.py", line 176, in set_number_next
'number_next_internal': value,
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/model/modelsql.py", line 953, in write
cls._validate(sub_records, field_names=all_field_names)
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/model/modelstorage.py", line 1133, in _validate
cls.validate(records)
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/ir/sequence.py", line 227, in validate
cls.check_last_timestamp(sequences)
File "/home/psk/.virtualenvs/tryton40/lib/python3.5/site-packages/trytond-4.0.1-py3.5.egg/trytond/ir/sequence.py", line 251, in check_last_timestamp
if sequence.last_timestamp > next_timestamp:
TypeError: unorderable types: NoneType() > int()