Ticket #20528: 20528.patch

wp-includes/canonical.php

@@ -439 +439 @@
  */
 function _remove_qs_args_if_not_in_url( $query_string, Array $args_to_check, $url ) {
         $parsed_url = @parse_url( $url );
-        parse_str( $parsed_url['query'], $parsed_query );
-        foreach ( $args_to_check as $qv ) {
-                if ( !isset( $parsed_query[$qv] ) )
-                        $query_string = remove_query_arg( $qv, $query_string );
+
+        if ( !empty( $parsed_url['query'] ) ) {
+                parse_str( $parsed_url['query'], $parsed_query );
+                foreach ( $args_to_check as $qv ) {
+                        if ( !isset( $parsed_query[$qv] ) ) {
+                                $query_string = remove_query_arg( $qv, $query_string );
+                        }
+                }
         }
+
         return $query_string;
 }