500: Internal Server Error

Traceback

Traceback (most recent call last):
  File "/home/godprisvvs/src/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 813, in dispatch
    r = self._call_function(**self.params)
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 370, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/godprisvvs/src/odoo/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 358, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 919, in __call__
    return self.method(*args, **kw)
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 544, in response_wrap
    response = f(*args, **kw)
  File "/home/godprisvvs/src/custom/website_sale_category_grid/controllers/website_sale.py", line 88, in shop
    'sub_categories': CategoryTableCompute().process(category.child_id, ppg=len(category.child_id.ids), ppr=result.qcontext.get('ppr', 4)) if category else False
Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/godprisvvs/src/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 813, in dispatch
    r = self._call_function(**self.params)
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 370, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/godprisvvs/src/odoo/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 358, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 919, in __call__
    return self.method(*args, **kw)
  File "/home/godprisvvs/src/odoo/odoo/http.py", line 544, in response_wrap
    response = f(*args, **kw)
  File "/home/godprisvvs/src/custom/website_sale_category_grid/controllers/website_sale.py", line 88, in shop
    'sub_categories': CategoryTableCompute().process(category.child_id, ppg=len(category.child_id.ids), ppr=result.qcontext.get('ppr', 4)) if category else False
AttributeError: 'str' object has no attribute 'child_id'