Notice : Undefined offset

I'm getting these too:

On admin/structure/taxonomy/name:

    Notice: Undefined offset: 0 in _menu_check_access() (line 633 of /includes/menu.inc).
    Notice: Undefined offset: 1 in _menu_check_access() (line 633 of /includes/menu.inc).
    ......

(snipped linux paths)

Thought it might be tied to either Taxonomy_Menu or something as when I visit a taxonomy page it seems to create a 0 length menu item (in Main Menu.. useful) and produces the following:

Notice: Undefined index: localized_options in menu_navigation_links() (line 1860 of /includes/menu.inc).

Commenting out that line:

 line 1860 of includes/menu.inc
//$l = $item['link']['localized_options'];

removes the error, but not the faux menu item..
The link in the faux item is taxonomy/term/%, so I think I have a faulty view somewhere.. still looking.

Disabled Taxonomy_Menu, still both errors.. bollocks.. will continue hunting through views.

EDIT: FYI: It does both of these without the administration_menu running.. I've granted a normal user-profile access to modify the taxonomy, and it appears on there too.. irritating.

We had a fresh install of Drupal 7 and admin views and admin menu modules. The exact same error messages showed when we enabled a new version of Admin Menu.

To remove the error messages:
- Disable the Admin Views Module
- Go to the Views UI and delete all existing Admin Views
- Renable the Admin Views Module

This cleared up the errors for us.

i you have reatten a custom module, and have called hook_menu, Do the following to you hook_menu Properties.

'access callback' => 'user_access',
to
'access callback' => TRUE,

Or if you give permission to all users this issue can be solved.

After A LOT of troubleshooting the cause of this error for me was a hook_menu() function that had a non-existent permission parameter. I added the hook_permission() for the missing 'access arguments' and the error was finally gone.

In order to resolve the Notice: Undefined offset: 0 in _menu_check_access ()
Add the 'access arguments' => array (//args) in hook_menu () implementation. Use following combinations for 'access arguments' to acces the content of the your specified menu

1. Anonymous users
'access arguments' => array('access content'),

2. Authenticated users
'access callback' => 'user_is_logged_in',
'access arguments' => array('access content'),

3. Only administer users
'access arguments' => array('administer users'),

Look https://www.drupal.org/node/553368 for more info on Access Arguments

Some of these solutions are a joke. They are not fixes for the problem. You're just altering the menu item to allow access to all or overriding the view arguments (by hard coding it). We're pretty sure this is a problem that occurs when you have two admins views using the same path. So likely a view has been cloned.

#2 fixed the notice for me. Thanks wylbur.

There is no patch on this issue to review so changing the status to 'active'