Fairly regularly, and for different sites, I see a message such as this:
         Warning: Warning, link #20 empty
in the log file.

The number (20 in this case) varies of course and is the offset into the
array of pointers to lien_url structs in httpmirror() (htscore.c). This
message is given when that particular offset has a NULL pointer. What would
cause this? I tried to trace the code, but was not successful at tracking
what was going on. Is there some way to get the source address/file which
contains this 'empty link'?