Fix node id mapping lengthv0.1.1

1 files changed, 5 insertions, 5 deletions

diff --git a/serialize.go b/serialize.go
index 5f0c461..4ec2b94 100644
--- a/serialize.go
+++ b/serialize.go
@@ -151,16 +151,16 @@ func Serialize(blk *MapBlk, w io.Writer, idNameMap map[string]mt.Content) {
 		panic(err)
 	}
 
-	var nameIdMapCount = uint16(len(idNameMap))
-	if err := binary.Write(w, binary.BigEndian, &nameIdMapCount); err != nil {
-		panic(err)
-	}
-
 	var exists = make(map[mt.Content]struct{})
 	for i := 0; i < 4096; i++ {
 		exists[blk.Param0[i]] = struct{}{}
 	}
 
+	var nameIdMapCount = uint16(len(exists))
+	if err := binary.Write(w, binary.BigEndian, &nameIdMapCount); err != nil {
+		panic(err)
+	}
+
 	for name, id := range idNameMap {
 		if _, ok := exists[id]; !ok {
 			continue