Address doesn't support umlauts

[JamesPoel]

One of my address paramters has an umlaut, so I am utf8_encoding it to correctly display it in the vcard.
This works for other fields, but for address, it produces an error.

Example:

$vcard->addAddress(null, null, 'street', utf8_decode( 'woërktown' ), null, 'workpostcode', 'Belgium');

array_chunk() expects parameter 1 to be array, bool given
vendor/jeroendesloovere/vcard/src/VCard.php:655

It is this line that is to blame:
$array = array_chunk(
preg_split("//u", $body, -1, PREG_SPLIT_NO_EMPTY), $chunklen);

If i change it to:
$array = array_chunk(str_split($body));

it works.