500: Internal Server Error

Traceback

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 806, in dispatch
    r = self._call_function(**self.params)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 359, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 347, in checked_call
    result = self.endpoint(*a, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 912, in __call__
    return self.method(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 531, in response_wrap
    response = f(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/addons/website_blog/controllers/main.py", line 175, 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 "/opt/odoo/addons/website_blog_based_on_language/controllers/main.py", line 23, in _prepare_blog_values
    res = super(BlogLanguageWise, self)._prepare_blog_values(blogs, blog=blog, date_begin=date_begin, date_end=date_end, tags=tags, state=state, page=page, search=search)
  File "/usr/lib/python3/dist-packages/odoo/addons/website_blog/controllers/main.py", line 119, in _prepare_blog_values
    all_tags = blog and blogs.all_tags()[blog.id] or blogs.all_tags(join=True)
Exception

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

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 806, in dispatch
    r = self._call_function(**self.params)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 359, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 347, in checked_call
    result = self.endpoint(*a, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 912, in __call__
    return self.method(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 531, in response_wrap
    response = f(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/addons/website_blog/controllers/main.py", line 175, 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 "/opt/odoo/addons/website_blog_based_on_language/controllers/main.py", line 23, in _prepare_blog_values
    res = super(BlogLanguageWise, self)._prepare_blog_values(blogs, blog=blog, date_begin=date_begin, date_end=date_end, tags=tags, state=state, page=page, search=search)
  File "/usr/lib/python3/dist-packages/odoo/addons/website_blog/controllers/main.py", line 119, in _prepare_blog_values
    all_tags = blog and blogs.all_tags()[blog.id] or blogs.all_tags(join=True)
KeyError: 1