diff --git a/erpnext/patches/v11_0/refactor_naming_series.py b/erpnext/patches/v11_0/refactor_naming_series.py
index 9f4687c..a3682de 100644
--- a/erpnext/patches/v11_0/refactor_naming_series.py
+++ b/erpnext/patches/v11_0/refactor_naming_series.py
@@ -136,7 +136,7 @@
 		property_setter.flags.validate_fields_for_doctype = True
 		try:
 			property_setter.insert()
-		except DuplicateEntryError:
+		except frappe.DuplicateEntryError:
 			name = "{0}-{1}-{2}-1".format(doctype, fieldname, property)
 			property_setter.name = name
 			property_setter.insert()
\ No newline at end of file