[TYPO3-shop] gethostbyaddr(): Address is not a valid IPv4...

[daniel]

Hello list,
I'm using typo 4.0 with tt_products 2.4.11 .. when the order is sent and 
the confirmation appears, this error comes at the top of the screen:

Warning: gethostbyaddr(): Address is not a valid IPv4 or IPv6 address in 
/xxxxx/xxx/xxxx/htdocs/typo4/typo3_src-4.0/t3lib/class.t3lib_htmlmail.php 
on line 274

the order-mail and everything works fine ...any idea how to remove this 
message in the frontend ?

Thanks

Daniel