Error:
Odoo Server Error

Traceback (most recent call last):
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 619, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 309, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/home/odoo/src/odoo/13.0/odoo/tools/pycompat.py", line 14, in reraise
    raise value
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 664, in dispatch
    result = self._call_function(**self.params)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 345, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/service/model.py", line 93, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 338, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 909, in __call__
    return self.method(*args, **kw)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 510, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo/src/odoo/13.0/addons/web/controllers/main.py", line 1319, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/home/odoo/src/odoo/13.0/addons/web/controllers/main.py", line 1311, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/api.py", line 391, in call_kw
    result = _call_kw_model(method, model, args, kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/api.py", line 364, in _call_kw_model
    result = method(recs, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/addons/mail/models/mail_activity.py", line 527, in get_activity_data
    activity_type_id = group['activity_type_id'][0]
TypeError: 'bool' object is not subscriptable