line 88 is:
echo "<option value='{$v}" . selected( $v, $order, false ) . ">{$v}</option>";
but because there's no quotemark after "value='{$v}" the whole widget managemend admin page blows up
it should be:
echo "%lt;option value='{$v}<strong>'</strong>" . selected( $v, $order, false ) . ">{$v}</option>";