diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index 1f7b858..e098778 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 = "7f4ebe7"
+var _Commit = "7500ee1"
 var _Version = "Release 4.4.0"
 
 // Version returns the version of the obitools package.
diff --git a/pkg/obitax/taxonomy.go b/pkg/obitax/taxonomy.go
index b022df8..8ca7bc7 100644
--- a/pkg/obitax/taxonomy.go
+++ b/pkg/obitax/taxonomy.go
@@ -145,7 +145,6 @@ func (taxonomy *Taxonomy) Taxon(taxid string) (*Taxon, bool, error) {
 	}
 
 	taxon := taxonomy.nodes.Get(id)
-	isAlias := taxon.Node.id != id
 
 	if taxon == nil {
 		return nil,
@@ -155,6 +154,8 @@ func (taxonomy *Taxonomy) Taxon(taxid string) (*Taxon, bool, error) {
 				taxonomy.name)
 	}
 
+	isAlias := taxon.Node.id != id
+
 	return taxon, isAlias, nil
 }