torrent.go | 3 +++

diff --git a/torrent.go b/torrent.go
index 70e4ecd8d81addf1e86d68d8d4185b70ecda91ef..da71ba93168be13f1b5394edb267f3eea197474c 100644
--- a/torrent.go
+++ b/torrent.go
@@ -158,6 +158,9 @@ 	return
 }
 
 func (t *Torrent) decPieceAvailability(i pieceIndex) {
+	if !t.haveInfo() {
+		return
+	}
 	p := t.piece(i)
 	if p.availability <= 0 {
 		panic(p.availability)