Ticket #14201: 14201.patch

wp-includes/rewrite.php

@@ -1030 +1030 @@
                 if ( empty($this->category_base) )
                         $this->category_structure = trailingslashit( $this->front . 'category' );
                 else
-                        $this->category_structure = trailingslashit( '/' . $this->root . $this->category_base );
+                        $this->category_structure = trailingslashit( '/' . $this->root . rawurlencode( $this->category_base ) );
 
                 $this->category_structure .= '%category%';