Netboot: don't fail if no netboot url is returned

1 files changed, 4 insertions, 2 deletions

diff --git a/netboot/netboot.go b/netboot/netboot.go
index c88cb44..97a3240 100644
--- a/netboot/netboot.go
+++ b/netboot/netboot.go
@@ -87,7 +87,9 @@ func ConversationToNetconf(conversation []dhcpv6.DHCPv6) (*NetConf, string, erro
 			return nil, "", errors.New("no bootfile URL option found in ADVERTISE")
 		}
 	}
-	obf := opt.(*dhcpv6.OptBootFileURL)
-	bootfile = string(obf.BootFileURL)
+	if opt != nil {
+		obf := opt.(*dhcpv6.OptBootFileURL)
+		bootfile = string(obf.BootFileURL)
+	}
 	return netconf, bootfile, nil
 }