diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index e5ddddc..d3ad99c 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 = "2ab6f67"
+var _Commit = "5a3705b"
 var _Version = "Release 4.4.0"
 
 // Version returns the version of the obitools package.
diff --git a/pkg/obitools/obitag/obitag.go b/pkg/obitools/obitag/obitag.go
index b07f66f..aee10dd 100644
--- a/pkg/obitools/obitag/obitag.go
+++ b/pkg/obitools/obitag/obitag.go
@@ -257,8 +257,8 @@ func CLIAssignTaxonomy(iterator obiiter.IBioSequence,
 		references[j] = seq
 		refcounts[j] = obikmer.Count4Mer(seq, &buffer, nil)
 		taxon := seq.Taxon(taxo)
-		taxa.Set(j, taxon)
 		if taxon != nil {
+			taxa.Set(j, taxon)
 			j++
 		} else {
 			obilog.Warnf("Taxid %s is not described in the taxonomy %s."+