torrent-piece-request-order.go | 8 +++++---

diff --git a/torrent-piece-request-order.go b/torrent-piece-request-order.go
index 17206679e86919c8fa79a77326e927d8e9a7496f..10623da0b5d83594c396a14a11a2599123b44151 100644
--- a/torrent-piece-request-order.go
+++ b/torrent-piece-request-order.go
@@ -8,9 +8,11 @@ func (t *Torrent) updatePieceRequestOrder(pieceIndex int) {
 	if t.storage == nil {
 		return
 	}
-	t.cl.pieceRequestOrder[t.clientPieceRequestOrderKey()].Update(
-		t.pieceRequestOrderKey(pieceIndex),
-		t.requestStrategyPieceOrderState(pieceIndex))
+	if ro, ok := t.cl.pieceRequestOrder[t.clientPieceRequestOrderKey()]; ok {
+		ro.Update(
+			t.pieceRequestOrderKey(pieceIndex),
+			t.requestStrategyPieceOrderState(pieceIndex))
+	}
 }
 
 func (t *Torrent) clientPieceRequestOrderKey() interface{} {