storage/bolt_piece.go | 9 +++++++--

diff --git a/storage/bolt_piece.go b/storage/bolt_piece.go
index a932bea4cec05686bdffe5cac26ef9d108bbc5ae..663ac35a7762623f81af93fce43e8c2dd6956661 100644
--- a/storage/bolt_piece.go
+++ b/storage/bolt_piece.go
@@ -4,7 +4,6 @@ import (
 	"encoding/binary"
 	"io"
 
-	"github.com/anacrolix/missinggo/x"
 	"go.etcd.io/bbolt"
 
 	"github.com/anacrolix/torrent/metainfo"
@@ -32,7 +31,13 @@ }
 
 func (me *boltDBPiece) Completion() Completion {
 	c, err := me.pc().Get(me.pk())
-	x.Pie(err)
+	switch err {
+	case bbolt.ErrDatabaseNotOpen:
+		return Completion{}
+	case nil:
+	default:
+		panic(err)
+	}
 	return c
 }