diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index c2ef408..102059c 100644
--- a/pkg/obioptions/version.go
+++ b/pkg/obioptions/version.go
@@ -8,7 +8,7 @@ import (
 // corresponds to the last commit, and not the one when the file will be
 // commited
 
-var _Commit = "3424d30"
+var _Commit = "6cb7a5a"
 var _Version = "Release 4.4.0"
 
 // Version returns the version of the obitools package.
diff --git a/pkg/obitools/obirefidx/obirefidx.go b/pkg/obitools/obirefidx/obirefidx.go
index cc7cf6d..1e4dd74 100644
--- a/pkg/obitools/obirefidx/obirefidx.go
+++ b/pkg/obitools/obirefidx/obirefidx.go
@@ -56,8 +56,6 @@ func IndexSequence(seqidx int,
 		refs[pseq.Taxon(i).Node] = &temp
 	}
 
-	// log.Infof("%s length of path: %d", sequence.Id(), len(refs))
-
 	n := taxa.Len()
 	lcaCache := make(map[*obitax.TaxNode]*obitax.TaxNode, n)
 
@@ -89,10 +87,10 @@ func IndexSequence(seqidx int,
 	var matrix []uint64
 
 	// obilog.Warnf("%s : %s", sequence.Id(), pseq.String())
+
 	for idx_path := 1; idx_path < path_len; idx_path++ {
 		mini := -1
 		seqidcs := refs[pseq.Taxon(idx_path).Node]
-
 		ns := len(*seqidcs)
 
 		if ns > 0 {
@@ -167,7 +165,6 @@ func IndexSequence(seqidx int,
 
 	obitag_index := make(map[int]string, pseq.Len())
 
-	// obilog.Warnf("(%s,%s): %v", sequence.Id(), pseq.Taxon(0).String(), closest)
 	for i, d := range closest {
 		if i < (len(closest)-1) && d < closest[i+1] {
 			current_taxon := pseq.Taxon(i)
@@ -175,6 +172,10 @@ func IndexSequence(seqidx int,
 		}
 	}
 
+	if len(obitag_index) == 0 {
+		obitag_index[0] = pseq.Taxon(pseq.Len() - 1).String()
+	}
+
 	/*
 		 	log.Println(sequence.Id(), tseq.Taxid(), tseq.ScientificName(), tseq.Rank(), obitag_index)
 			log.Println(sequence.Id(), tseq.Taxid(), tseq.ScientificName(), tseq.Rank(), nseq)
diff --git a/pkg/obitools/obitag/obitag.go b/pkg/obitools/obitag/obitag.go
index 884960f..c6be284 100644
--- a/pkg/obitools/obitag/obitag.go
+++ b/pkg/obitools/obitag/obitag.go
@@ -213,6 +213,10 @@ func Identify(sequence *obiseq.BioSequence,
 				taxon = match_taxon
 			}
 
+			if taxon.IsRoot() {
+				break
+			}
+
 		}
 
 		log.Debugln(sequence.Id(), "Best matches:", len(bests), "New index:", newidx)