I have modified menu items in odoo10. After that users with the settings rights are getting 500 Internal Server error. Users without the settings access are able to access the web. I can access the Settings by adding the ?debug in the url.

ERROR odoo_db werkzeug: Error on request:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/odoo/addons/base/ir/ir_http.py", line 169, in _handle_exception
return request._handle_exception(exception)
File "/usr/lib/python2.7/dist-packages/odoo/http.py", line 766, in _handle_exception
return super(HttpRequest, self)._handle_exception(exception)
File "/usr/lib/python2.7/dist-packages/odoo/addons/base/ir/ir_http.py", line 195, in _dispatch
result = request.dispatch()
File "/usr/lib/python2.7/dist-packages/odoo/http.py", line 825, in dispatch
r = self._call_function(**self.params)
File "/usr/lib/python2.7/dist-packages/odoo/http.py", line 331, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/odoo/service/model.py", line 119, in wrapper
return f(dbname, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/odoo/http.py", line 324, in checked_call
result = self.endpoint(*a, **kw)
File "/usr/lib/python2.7/dist-packages/odoo/http.py", line 933, in call
return self.method(*args, **kw)
File "/usr/lib/python2.7/dist-packages/odoo/http.py", line 504, in response_wrap
response = f(*args, **kw)
File "/usr/lib/python2.7/dist-packages/odoo/addons/web/controllers/main.py", line 440, in web_client
context = request.env['ir.http'].webclient_rendering_context()
File "/usr/lib/python2.7/dist-packages/odoo/addons/web/models/ir_http.py", line 17, in webclient_rendering_context
'menu_data': request.env['ir.ui.menu'].load_menus(request.debug),
File "", line 2, in load_menus

File "/usr/lib/python2.7/dist-packages/odoo/tools/cache.py", line 87, in lookup
value = d[key] = self.method(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/odoo/addons/web_tour/models/ir_ui_menu.py", line 35, in load_menus
_find_subtree(menu_root, menu_id)['xmlid'] = menu_xmlid
TypeError: 'NoneType' object does not support item assignment

Please help.