Error Odoo 14 when drag chart on gantt chart view

[mfaffrodi]

I've got error when dragging chart (to be longer or shorter).
Below is the error messages

Error:
Odoo Server Error

Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
result = request.dispatch()
File "/usr/lib/python3/dist-packages/odoo/http.py", line 683, in dispatch
result = self._call_function(**self.params)
File "/usr/lib/python3/dist-packages/odoo/http.py", line 359, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 94, in wrapper
return f(dbname, *args, **kwargs)
File "/usr/lib/python3/dist-packages/odoo/http.py", line 347, in checked_call
result = self.endpoint(*a, **kw)
File "/usr/lib/python3/dist-packages/odoo/http.py", line 912, in call
return self.method(*args, **kw)
File "/usr/lib/python3/dist-packages/odoo/http.py", line 531, in response_wrap
response = f(*args, **kw)
File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 1389, in call_kw
return self._call_kw(model, method, args, kwargs)
File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 1381, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/usr/lib/python3/dist-packages/odoo/api.py", line 396, in call_kw
result = _call_kw_multi(method, model, args, kwargs)
File "/usr/lib/python3/dist-packages/odoo/api.py", line 383, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/usr/lib/python3/dist-packages/odoo/addons/project/models/project.py", line 1136, in write
result = super(Task, tasks).write(vals)
File "/usr/lib/python3/dist-packages/odoo/addons/mail/models/mail_thread.py", line 322, in write
result = super(MailThread, self).write(values)
File "/usr/lib/python3/dist-packages/odoo/addons/mail/models/mail_activity.py", line 766, in write
return super(MailActivityMixin, self).write(vals)
File "/usr/lib/python3/dist-packages/odoo/addons/rating/models/rating_mixin.py", line 82, in write
result = super(RatingMixin, self).write(values)
File "/usr/lib/python3/dist-packages/odoo/models.py", line 3589, in write
raise ValueError("Invalid field %r on model %r" % (fname, self._name))
Exception

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

Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/odoo/http.py", line 639, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/usr/lib/python3/dist-packages/odoo/http.py", line 315, in _handle_exception
raise exception.with_traceback(None) from new_cause
ValueError: Invalid field 'undefined' on model 'project.task'

[obayit]

This should be fixed now.