diff --git a/tabellio/searchform/form.py b/tabellio/searchform/form.py
index 7697a11..27c69a1 100644
--- a/tabellio/searchform/form.py
+++ b/tabellio/searchform/form.py
@@ -294,6 +294,8 @@ def possible_sessions(context):
 def possible_polgroups(context):
     current = getToolByName(context, 'portal_url').getPortalObject()
     settings = component.getUtility(IRegistry).forInterface(ITabellioSettings, False)
+    if not settings.polgroupsPath:
+        return SimpleVocabulary([])
     for part in settings.polgroupsPath.split('/'):
         if not part:
              continue