ERROR:tryton.common.common:  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/win_search.py", line 132, in response
    self.callback(res)

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/view/form_gtk/many2one.py", line 267, in callback
    self.value_from_id(*result[0]), force_change=True)

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/model/field.py", line 394, in set_client
    force_change=force_change)

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/model/field.py", line 143, in set_client
    self.sig_changed(record)

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/model/field.py", line 43, in sig_changed
    record.on_change(self.name, self.attrs['on_change'])

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/model/record.py", line 515, in on_change
    self.set_on_change(res)

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/model/record.py", line 462, in set_on_change
    field_x2many.set_on_change(self, value)

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/model/field.py", line 649, in set_on_change
    self._set_value(record, value)

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/model/field.py", line 596, in _set_value
    field_names = set(f for v in value for f in v if f not in fields)

  File "/usr/local/lib/python2.7/dist-packages/tryton/gui/window/view_form/model/field.py", line 596, in <genexpr>
    field_names = set(f for v in value for f in v if f not in fields)

unhashable type: 'list'