Error:
Odoo Server Error

Traceback (most recent call last):
  File "/home/odoo/src/odoo/12.0/odoo/api.py", line 1032, in get
KeyError: (<odoo.sql_db.Cursor object at 0x7f2d80831c88>, 142)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/odoo/src/odoo/12.0/odoo/fields.py", line 970, in __get__
  File "/home/odoo/src/odoo/12.0/odoo/api.py", line 1034, in get
odoo.exceptions.CacheMiss: ('crm.lead(4087731,).date_closed', None)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/odoo/src/odoo/12.0/odoo/http.py", line 653, in _handle_exception
  File "/home/odoo/src/odoo/12.0/odoo/http.py", line 312, in _handle_exception
  File "/home/odoo/src/odoo/12.0/odoo/tools/pycompat.py", line 87, in reraise
  File "/home/odoo/src/odoo/12.0/odoo/http.py", line 695, in dispatch
  File "/home/odoo/src/odoo/12.0/odoo/http.py", line 344, in _call_function
  File "/home/odoo/src/odoo/12.0/odoo/service/model.py", line 97, in wrapper
  File "/home/odoo/src/odoo/12.0/odoo/http.py", line 337, in checked_call
  File "/home/odoo/src/odoo/12.0/odoo/http.py", line 938, in __call__
  File "/home/odoo/src/odoo/12.0/odoo/http.py", line 517, in response_wrap
  File "/home/odoo/src/odoo/12.0/addons/web/controllers/main.py", line 962, in call_kw
  File "/home/odoo/src/odoo/12.0/addons/web/controllers/main.py", line 954, in _call_kw
  File "/home/odoo/src/odoo/12.0/odoo/api.py", line 745, in call_kw
  File "/home/odoo/src/odoo/12.0/odoo/api.py", line 718, in _call_kw_model
  File "/home/odoo/src/enterprise/12.0/web_cohort/models/models.py", line 87, in get_cohort_data
  File "/home/odoo/src/enterprise/12.0/web_cohort/models/models.py", line 87, in <listcomp>
  File "/home/odoo/src/odoo/12.0/odoo/models.py", line 5047, in __getitem__
  File "/home/odoo/src/odoo/12.0/odoo/fields.py", line 974, in __get__
  File "/home/odoo/src/odoo/12.0/odoo/fields.py", line 1075, in determine_value
  File "/home/odoo/src/odoo/12.0/odoo/models.py", line 2813, in _prefetch_field
  File "/home/odoo/src/odoo/12.0/odoo/models.py", line 2757, in read
  File "/home/odoo/src/odoo/12.0/odoo/models.py", line 2895, in _read_from_database
  File "/usr/lib/python3.5/_collections_abc.py", line 773, in update
  File "/home/odoo/src/odoo/12.0/odoo/models.py", line 5475, in __setitem__
  File "/home/odoo/src/odoo/12.0/odoo/api.py", line 1041, in set
MemoryError