Bug in /wp-includes/nav-menu.php

[shopandstore]

hello.
updated to 3.31
In my dashboard, while clicking to the Appearence> menus> there appears an error, that the function wp_trim_words is unknown;
the opened the nav-menu.php and saw these:

if ( empty( $menu_item->description ) ) 
$menu_item->description = apply_filters( 'nav_menu_description',  wp_trim_words( $menu_item->post_content, 200 ) );

### it seemed to me something unknown, then i simply added the following

'{' $menu_item->description = apply_filte.........content, 200 ) ); '}'

}}}

and error was corrected.

[shopandstore]

sorry, the last paragraph was written unclearly. in short, when i added {} brackets after if() parameter, there wan no error anymore.

[nacin]

What was the error?

[shopandstore]

Call to undefined function wp_trim_words()

[nacin]

Brackets shouldn't have changed anything. Try a manual update. The function exists, I assure you.

[shopandstore]

thnaks