VirtueMart [WARNING] [demo] Could not send a message to , ()

[tez]

What does this mean?

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00:51:44 15/02/10 VirtueMart [WARNING] [66.211.170.66] [demo] Could not send a message to   ,  ()


It is in my shop log and sent an email like this

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Hello,
                a Failed PayPal Transaction on http://xxx requires your attention.
                -----------------------------------------------------------
                Order ID:
                User ID:
                Payment Status returned by PayPal: 
               
                Response from www.paypal.com: HTTP/1.1 200 OK
Date: Mon, 15 Feb 2010 08:51:43 GMT
Server: Apache
Set-Cookie: zxy etc; domain=.paypal.com; path=/
Set-Cookie: cookie_check=yes; expires=Thu, 13-Feb-2020 08:51:44 GMT; domain=.paypal.com; path=/
Set-Cookie: navcmd=_notify-validate; domain=.paypal.com; path=/
Set-Cookie: navlns=0; expires=Sun, 10-Feb-2030 08:51:44 GMT; domain=.paypal.com; path=/
Vary: Accept-Encoding
Connection: close
Content-Type: text/html; charset=UTF-8

VERIFIED


I don't see any customer orders or activity during this date. It looks like PayPal just pinged the notify URL for no reason.