Error traceback

ERROR:tryton.common.common:  File "/home/martin/Programs/client/tryton-3.0.1/tryton/gui/window/view_form/view/list_gtk/parser.py", line 85, in wrapper
    return func(self, *args, **kwargs)

  File "/home/martin/Programs/client/tryton-3.0.1/tryton/gui/window/view_form/view/list_gtk/parser.py", line 566, in setter
    super(Float, self).setter(column, cell, store, iter)

  File "/home/martin/Programs/client/tryton-3.0.1/tryton/gui/window/view_form/view/list_gtk/parser.py", line 85, in wrapper
    return func(self, *args, **kwargs)

  File "/home/martin/Programs/client/tryton-3.0.1/tryton/gui/window/view_form/view/list_gtk/parser.py", line 371, in setter
    text = self.get_textual_value(record)

  File "/home/martin/Programs/client/tryton-3.0.1/tryton/gui/window/view_form/view/list_gtk/parser.py", line 479, in get_textual_value
    return record[self.field_name].get_client(record, factor=self.factor)

  File "/home/martin/Programs/client/tryton-3.0.1/tryton/gui/window/view_form/model/field.py", line 329, in get_client
    factor=Decimal(str(factor)))

  File "/home/martin/Programs/client/tryton-3.0.1/tryton/gui/window/view_form/model/field.py", line 310, in get_client
    return locale.format('%.*f', (digit, value * factor), True)

unsupported operand type(s) for *: 'float' and 'Decimal'