Regression: Taxonomy exception when adding a categorie

1) Go to Document/Taxonomies in Go Green Enterprise
2) Click en and Edit
3) Click New
4) In the New Category set a name and key
5) Press OK
Expected: category created
Actual:
Exception:
[INFO] [talledLocalContainer] Caused by: java.lang.IllegalArgumentException: Could not get a Category for 'new-categoryoo'.
[INFO] [talledLocalContainer] at org.onehippo.taxonomy.plugin.tree.CategoryNode.<init>(CategoryNode.java:37)
[INFO] [talledLocalContainer] at org.onehippo.taxonomy.plugin.TaxonomyEditorPlugin$3$1.onOk(TaxonomyEditorPlugin.java:216)