cURL error in IP log files

[Sissy]

I am running pfBlockerNG-devel version 3.0.0_16.

I believe that where ASN should be, my IP log files are showing "cURL Error | 0". Here is an example from ip_block.log:

Jun 14 20:58:19,1461429920,igb0,WAN,block,4,6,TCP-S,91.191.209.236,192.168.0.200,32880,25,in,BG,pfB_Europe_v4,91.191.208.0/20,BG_v4,Unknown,local ip addresses for #########.### servers,cURL Error | 0,-
Jun 14 20:58:19,1461429920,igb0,WAN,block,4,6,TCP-S,91.191.209.236,192.168.0.200,32880,25,in,BG,pfB_Europe_v4,91.191.208.0/20,BG_v4,Unknown,local ip addresses for #########.### servers,cURL Error | 0,-
Jun 14 20:58:19,1461429920,igb0,WAN,block,4,6,TCP-S,91.191.209.236,192.168.0.200,32880,25,in,BG,pfB_Europe_v4,91.191.208.0/20,BG_v4,Unknown,local ip addresses for #########.### servers,cURL Error | 0,-
Jun 14 20:58:19,1461429920,igb0,WAN,block,4,6,TCP-S,91.191.209.236,192.168.0.200,32880,25,in,BG,pfB_Europe_v4,91.191.208.0/20,BG_v4,Unknown,local ip addresses for #########.### servers,cURL Error | 0,-
Jun 14 20:58:19,1461429920,igb0,WAN,block,4,6,TCP-S,91.191.209.236,192.168.0.200,32880,25,in,BG,pfB_Europe_v4,91.191.208.0/20,BG_v4,Unknown,local ip addresses for #########.### servers,cURL Error | 0,-
Jun 14 20:58:19,1461429920,igb0,WAN,block,4,6,TCP-S,91.191.209.236,192.168.0.200,32880,25,in,BG,pfB_Europe_v4,91.191.208.0/20,BG_v4,Unknown,local ip addresses for #########.### servers,cURL Error | 0,-

Please note that I substituted "#########.###" for my domain name for reasons of privacy.

Is this an indication that something is misconfigured? This is an instance of pfSense that has been reliably running for many years. I've just now started looking at the raw logs and wanted to know if there's something I can do in order to get the ASN (I assume of the source IP) to be resolved properly?

Thanks in advance to anyone who lends a hand resolving this.