check if peer id exists

tracker/peer.go

@@ -15,7 +15,9 @@ type Peer struct {
 // Set from the non-compact form in BEP 3.
 func (p *Peer) fromDictInterface(d map[string]interface{}) {
 	p.IP = net.ParseIP(d["ip"].(string))
+	if _, ok := d["peer id"]; ok {
 		p.ID = []byte(d["peer id"].(string))
+	}
 	p.Port = int(d["port"].(int64))
 }