def read_group(self, cr, uid, domain, fields, groupby, offset=0, limit=None, context=None):
groupby_list = groupby
- groupby = groupby[0]
+ if isinstance(groupby, list):
+ groupby = groupby[0]
context = context or {}
self.pool.get('ir.model.access').check(cr, uid, self._name, 'read', context=context)
if not fields: