Notice encountered with WP_DEBUG set to true

[shdus]

I set WP_DEBUG to true, and was surprised to see two notices from the core show up in the header of my of my WordPress pages.

Notice: Undefined index: link_before in .../wp-includes/post-template.php on line 841

Notice: Undefined index: link_after in .../wp-includes/post-template.php on line 841

[ocean90]

Which WP version do you use? Which theme do you use? Does your theme use wp_page_menu()? If yes, can you post the code block?

[ocean90]

Ok, it' Twentyten.

See #13293.