Cannot update menu (Error 500)

  • Hi,
    When trying to save menu in Appearance->Menu (nav-menus.php) i get error 500. I’ve discovered that it only happens when “NextGEN Gallery” or “User Access Manager” plugins are enabled – Those are the only 2 that create their own menu group in wordpress sidebar.

    After activating debug mode, my log file says:

    [06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 23
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 45
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 49
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 62
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 74
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 138
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 138
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 152
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 156
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 199
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 212
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 236
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 245
[06-Jan-2016 08:39:38 UTC] PHP Notice:  Array to string conversion in /var/www/html/lesnicka-skola.cz/www/wp-admin/menu.php on line 255
[06-Jan-2016 08:39:38 UTC] PHP Warning:  Invalid argument supplied for foreach() in /var/www/html/lesnicka-skola.cz/www/wp-admin/includes/menu.php on line 45
[06-Jan-2016 08:39:38 UTC] PHP Warning:  Invalid argument supplied for foreach() in /var/www/html/lesnicka-skola.cz/www/wp-admin/includes/menu.php on line 93
[06-Jan-2016 08:39:38 UTC] PHP Fatal error:  [] operator not supported for strings in /var/www/html/lesnicka-skola.cz/www/wp-admin/includes/plugin.php on line 1066

    Any ideas what’s wrong and how to fix it?

    Thank you.

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