when i try to load product model with a computing one2many field it shows the below error..i want to load a one2may field which shows the product quantity in location wise.

traceback (most recent call last):
  File "/home/odoo-10.0/odoo/http.py", line 640, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo-10.0/odoo/http.py", line 677, in dispatch
    result = self._call_function(**self.params)
  File "/home/odoo-10.0/odoo/http.py", line 333, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo-10.0/odoo/service/model.py", line 101, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo-10.0/odoo/http.py", line 326, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo-10.0/odoo/http.py", line 935, in __call__
    return self.method(*args, **kw)
  File "/home/odoo-10.0/odoo/http.py", line 506, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo-10.0/addons/web/controllers/main.py", line 827, in search_read
    return self.do_search_read(model, fields, offset, limit, domain, sort)
  File "/home/odoo-10.0/addons/web/controllers/main.py", line 849, in do_search_read
    offset=offset or 0, limit=limit or False, order=sort or False)
  File "/home/odoo-10.0/odoo/models.py", line 4695, in search_read
    result = records.read(fields)
  File "/home/odoo-10.0/odoo/models.py", line 3021, in read
    values[name] = field.convert_to_read(record[name], record, use_name_get)
  File "/home/odoo-10.0/odoo/models.py", line 5210, in __getitem__
    return self._fields[key].__get__(self, type(self))
  File "/home/odoo-10.0/odoo/fields.py", line 873, in __get__
    value = record._cache[self]
  File "/home/odoo-10.0/odoo/models.py", line 5561, in __getitem__
    value = self._recs.env.cache[field][self._recs.id]
KeyError: 1