500: Internal Server Error

Traceback

Traceback (most recent call last):
  File "/home/odoo-system/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/home/odoo-system/odoo/odoo/http.py", line 813, in dispatch
    r = self._call_function(**self.params)
  File "/home/odoo-system/odoo/odoo/http.py", line 370, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo-system/odoo/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo-system/odoo/odoo/http.py", line 358, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo-system/odoo/odoo/http.py", line 919, in __call__
    return self.method(*args, **kw)
  File "/home/odoo-system/odoo/odoo/http.py", line 544, in response_wrap
    response = f(*args, **kw)
  File "/mnt/extra-addons/gb_apps/gb_blog_subblogs/controllers/main.py", line 17, in blog
    res = super(WebsiteBlog, self).blog(blog=blog, tag=tag, page=page, search=search, **opt)
  File "/home/odoo-system/odoo/odoo/http.py", line 544, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo-system/odoo/addons/website_blog/controllers/main.py", line 202, in blog
    values = self._prepare_blog_values(blogs=blogs, blog=blog, date_begin=date_begin, date_end=date_end, tags=tag, state=state, page=page, search=search)
  File "/mnt/extra-addons/gb_apps/gb_blog_sorting/controllers/blog.py", line 72, in _prepare_blog_values
    _logger.info(blog.blog_post_sorting)
Exception

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

Traceback (most recent call last):
  File "/home/odoo-system/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/home/odoo-system/odoo/odoo/http.py", line 813, in dispatch
    r = self._call_function(**self.params)
  File "/home/odoo-system/odoo/odoo/http.py", line 370, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo-system/odoo/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo-system/odoo/odoo/http.py", line 358, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo-system/odoo/odoo/http.py", line 919, in __call__
    return self.method(*args, **kw)
  File "/home/odoo-system/odoo/odoo/http.py", line 544, in response_wrap
    response = f(*args, **kw)
  File "/mnt/extra-addons/gb_apps/gb_blog_subblogs/controllers/main.py", line 17, in blog
    res = super(WebsiteBlog, self).blog(blog=blog, tag=tag, page=page, search=search, **opt)
  File "/home/odoo-system/odoo/odoo/http.py", line 544, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo-system/odoo/addons/website_blog/controllers/main.py", line 202, in blog
    values = self._prepare_blog_values(blogs=blogs, blog=blog, date_begin=date_begin, date_end=date_end, tags=tag, state=state, page=page, search=search)
  File "/mnt/extra-addons/gb_apps/gb_blog_sorting/controllers/blog.py", line 72, in _prepare_blog_values
    _logger.info(blog.blog_post_sorting)
AttributeError: 'NoneType' object has no attribute 'blog_post_sorting'