client-tracker-announcer.go | 2 ++

diff --git a/client-tracker-announcer.go b/client-tracker-announcer.go
index f89c57d6b92c645a3c7636338525d17c95a9c099..1b51e6d7cce55de16fc4b08a95b67f444728eb19 100644
--- a/client-tracker-announcer.go
+++ b/client-tracker-announcer.go
@@ -121,6 +121,8 @@ 	)
 	me.trackerAnnounceHead.Init(func(a, b trackerAnnounceHeadRecord) int {
 		return cmp.Compare(a.url, b.url)
 	})
+	// Just empty url.
+	me.trackerAnnounceHead.SetMinRecord(trackerAnnounceHeadRecord{})
 	me.nextAnnounce = indexed.NewFullIndex(
 		&me.trackerAnnounceHead,
 		func(a, b trackerAnnounceHeadRecord) int {