Ampersand in profile field

If I use the ampersand character in a profile field, when saving I get an array of data within pre tags rather than the page reloading and updating successfully.

Array
(
    [XMLNS] => http://www.w3.org/1999/xhtml
    [head] => Array
        (
            [meta] => Array
                (
                    [HTTP-EQUIV] => Content-Type
                    [CONTENT] => text/html; charset=iso-8859-1
                )

            [title] => 500 - Internal server error.
            [style] => Array
                (
                    [TYPE] => text/css
                )

        )

    [body] => Array
        (
            [0] => Array
                (
                    [ID] => header
                    [h1] => Server Error
                )

            [1] => Array
                (
                    [ID] => content
                    [div] => Array
                        (
                            [CLASS] => content-container
                            [fieldset] => Array
                                (
                                    [h2] => 500 - Internal server error.
                                    [h3] => There is a problem with the resource you are looking for, and it cannot be displayed.
                                )

                        )

                )

        )

)