diff --git a/src/collective/dms/thesaurus/keywordsfield.py b/src/collective/dms/thesaurus/keywordsfield.py
index c9de03f..fafd684 100644
--- a/src/collective/dms/thesaurus/keywordsfield.py
+++ b/src/collective/dms/thesaurus/keywordsfield.py
@@ -73,6 +73,9 @@ class ThesaurusKeywordsWidget(SequenceWidget):
 
     def displayItems(self):
         thesaurus = utils.get_thesaurus_object(self.context)
+        if thesaurus is None:
+            return []
+
         thesaurus_path = '/'.join(thesaurus.getPhysicalPath())
         value = []
         for token in self.value: