diff --git a/erpnext/accounts/doctype/pricing_rule/utils.py b/erpnext/accounts/doctype/pricing_rule/utils.py
index 53115f9..ad98383 100644
--- a/erpnext/accounts/doctype/pricing_rule/utils.py
+++ b/erpnext/accounts/doctype/pricing_rule/utils.py
@@ -319,7 +319,9 @@
 	filtered_rules = []
 	for field in field_set:
 		if args.get(field):
-			filtered_rules = filter(lambda x: x[field]==args[field], pricing_rules)
+			# filter function always returns a filter object even if empty
+			# list conversion is necessary to check for an empty result
+			filtered_rules = list(filter(lambda x: x.get(field)==args.get(field), pricing_rules))
 			if filtered_rules: break
 
 	return filtered_rules or pricing_rules