diff --git a/cmd/tile38-server/main.go b/cmd/tile38-server/main.go
index 8052060d..4b2e14f4 100644
--- a/cmd/tile38-server/main.go
+++ b/cmd/tile38-server/main.go
@@ -419,7 +419,6 @@ Developer Options:
 	if showThreadsDisabled {
 		log.Warnf("thread flag is deprecated use GOMAXPROCS to set number of threads instead")
 	}
-
 	if err := server.Serve(host, port, dir, httpTransport, *metricsAddr); err != nil {
 		log.Fatal(err)
 	}
diff --git a/internal/collection/collection.go b/internal/collection/collection.go
index 87c39059..3d3cb5e5 100644
--- a/internal/collection/collection.go
+++ b/internal/collection/collection.go
@@ -62,8 +62,9 @@ type Collection struct {
 // New creates an empty collection
 func New() *Collection {
 	col := &Collection{
-		index:       geoindex.Wrap(&rbang.RTree{}),
-		values:      btree.New(32, nil),
+		items:       btree.New(byID),
+		index:       geoindex.Wrap(&rtree.RTree{}),
+		values:      btree.New(byValue),
 		fieldMap:    make(map[string]int),
 		fieldArr:    make([]string, 0),
 		fieldValues: &fieldValues{},
@@ -354,7 +355,7 @@ func (c *Collection) Scan(
 			return true
 		}
 		nextStep(count, cursor, deadline)
-		iitm := value.(*itemT)
+		iitm := item.(*itemT)
 		keepon = iterator(iitm.id, iitm.obj, c.fieldValues.get(iitm.fieldValuesSlot))
 		return keepon
 	}