diff --git a/cns/restserver/util.go b/cns/restserver/util.go
index 0af334133e..dbf49ab1ef 100644
--- a/cns/restserver/util.go
+++ b/cns/restserver/util.go
@@ -790,18 +790,20 @@ func (service *HTTPRestService) validateDefaultIPConfigsRequest(_ context.Contex
 }
 
 func isPrivateIP(ip net.IP) bool {
-	var privateIPBlocks []*net.IPNet
 
-	for _, cidr := range []string{
+	privateBlocks := []string{
 		"127.0.0.0/8",    // IPv4 loopback
 		"10.0.0.0/8",     // RFC1918
 		"172.16.0.0/12",  // RFC1918
 		"192.168.0.0/16", // RFC1918
 		"169.254.0.0/16", // RFC3927 link-local
-	} {
+	}
+
+	var privateIPBlocks []*net.IPNet
+	for _, cidr := range privateBlocks {
 		_, block, err := net.ParseCIDR(cidr)
 		if err != nil {
-			panic(fmt.Errorf("parse error on %q: %v", cidr, err))
+			logger.Errorf("Failed to parse CIDR")
 		}
 		privateIPBlocks = append(privateIPBlocks, block)
 	}