diff --git a/src/pfwbged/basecontent/indexers.py b/src/pfwbged/basecontent/indexers.py
index 5d64d97..ac0bdc4 100644
--- a/src/pfwbged/basecontent/indexers.py
+++ b/src/pfwbged/basecontent/indexers.py
@@ -39,7 +39,7 @@ def document_dynamic_searchable_text_indexer(obj):
             except (ConflictError, KeyboardInterrupt):
                 raise
 
-    if hasattr(obj, 'keywords'):
+    if hasattr(obj, 'keywords') and obj.keywords:
         factory = getUtility(IVocabularyFactory, 'dms.thesaurus.simple')
         vocabulary = factory(obj)
         for keyword in obj.keywords: