- ZCatalog: refreshCatalog() could not be called safely from a ZEO
        client script

doc/CHANGES.txt

@@ -49,6 +49,9 @@ Zope Changes
 
     Bugs fixed
 
+      - ZCatalog: refreshCatalog() could not be called safely from a ZEO
+        client script
+
       - Catalog.clear(): fixed handling of _length attribute (caused import
         problems for some .zexp files e.g. Squishdot instances)
 

lib/python/Products/ZCatalog/ZCatalog.py

@@ -231,7 +231,7 @@ class ZCatalog(Folder, Persistent, Implicit):
 
             for url in urls:
                 obj = self.resolve_path(url)
-                if not obj:
+                if not obj and hasattr(self, 'REQUEST'):
                     obj = self.resolve_url(url, REQUEST)
                 if obj is not None:
                     self.catalog_object(obj, url)