--- a/src/pyams_catalog/query.py	Wed Jun 17 09:55:51 2015 +0200
+++ b/src/pyams_catalog/query.py	Wed Jul 01 10:12:56 2015 +0200
@@ -38,7 +38,9 @@
         if isinstance(query, tuple):
             query = query[1]
         for oid in query:
-            yield intids.queryObject(oid)
+            target = intids.queryObject(oid)
+            if target is not None:
+                yield target
 
 
 def or_(source, added):