diff --git a/erpnext/setup/doctype/naming_series/naming_series.py b/erpnext/setup/doctype/naming_series/naming_series.py
index bb589b2..1b98682 100644
--- a/erpnext/setup/doctype/naming_series/naming_series.py
+++ b/erpnext/setup/doctype/naming_series/naming_series.py
@@ -21,6 +21,7 @@
 
 		prefixes = ""
 		for d in doctypes:
+			options = ""
 			try:
 				options = self.get_options(d)
 			except frappe.DoesNotExistError: