diff --git a/erpnext/setup/doctype/naming_series/naming_series.py b/erpnext/setup/doctype/naming_series/naming_series.py
index bb589b2a66..1b986827c2 100644
--- a/erpnext/setup/doctype/naming_series/naming_series.py
+++ b/erpnext/setup/doctype/naming_series/naming_series.py
@@ -21,6 +21,7 @@ class NamingSeries(Document):
 
 		prefixes = ""
 		for d in doctypes:
+			options = ""
 			try:
 				options = self.get_options(d)
 			except frappe.DoesNotExistError: