WARNING: Invalid source IP www.mypage.com for test (null), using default

[Heinelt Maik]

I'm using Hobbit 4.2.3 and for some pages, I monitore, I get the 
following message in bbtest.

WARNING: Invalid source IP www.mypage.com for test (null), using default

To be honest, I don't understand this error message, specially the "test (null)"
Looks like there running something wrong with this test.
I can ping the page from hobbit/xymon server and also other page monitoring is working well!