Wordpress - 警告：array_merge（）：参数＃2不是第662行的wp-includes \ load.php中的数组

Question

I have a problem in wordpress site. I get an error:

      Warning: array_merge(): Argument #2 is not an array in wp-includes\load.php on line 662

and because of this i cannot access admin area.

on line 662 in load.php file is this:

  $_REQUEST = array_merge( $_GET, $_POST );

which is a part of wp function:

     function wp_magic_quotes() {
        // If already slashed, strip.
       if ( get_magic_quotes_gpc() ) {
          $_GET    = stripslashes_deep( $_GET    );
          $_POST   = stripslashes_deep( $_POST   );
          $_COOKIE = stripslashes_deep( $_COOKIE );
       }

       // Escape with wpdb.
       $_GET    = add_magic_quotes( $_GET    );
       $_POST   = add_magic_quotes( $_POST   );
       $_COOKIE = add_magic_quotes( $_COOKIE );
       $_SERVER = add_magic_quotes( $_SERVER );

       // Force REQUEST to be GET + POST.
       $_REQUEST = array_merge( $_GET, $_POST );
     }

Has anyone ever encountered similar problem and maybe knows what can cause this.

I have tried to disable all the plugins and it didn't help

Thanks in advance for any help Rafal