diff --git a/src/api/routes/auth/register.ts b/src/api/routes/auth/register.ts
index 3e3f29243..7da796eb9 100644
--- a/src/api/routes/auth/register.ts
+++ b/src/api/routes/auth/register.ts
@@ -155,14 +155,18 @@ router.post(
                     throw new HTTPError("Your IP is blocked from registration");
                 }
 
-                if (register.blockAsnTypes.includes(ipData.asn.type)) {
+                if (ipData.asn.type && register.blockAsnTypes.includes(ipData.asn.type)) {
                     console.log(`[Register] ${ip} blocked from registration: IPData.co ASN type ${ipData.asn.type} is blocked`);
                     throw new HTTPError("Your IP is blocked from registration");
+                } else if (!ipData.asn.type) {
+                    console.log("[Register] IPData.co response missing asn.type field", ipData);
                 }
 
-                if (register.blockAsns.includes(ipData.asn.asn)) {
+                if (ipData.asn.asn && register.blockAsns.includes(ipData.asn.asn)) {
                     console.log(`[Register] ${ip} blocked from registration: IPData.co ASN ${ipData.asn.name} is blocked`);
                     throw new HTTPError("Your IP is blocked from registration");
+                } else if (!ipData.asn.asn) {
+                    console.log("[Register] IPData.co response missing asn.asn field", ipData);
                 }
             }
         }