diff --git a/erpnext/stock/report/supplier_wise_sales_analytics/supplier_wise_sales_analytics.py b/erpnext/stock/report/supplier_wise_sales_analytics/supplier_wise_sales_analytics.py
index 2a02b469fb0..6a86889aa3d 100644
--- a/erpnext/stock/report/supplier_wise_sales_analytics/supplier_wise_sales_analytics.py
+++ b/erpnext/stock/report/supplier_wise_sales_analytics/supplier_wise_sales_analytics.py
@@ -94,9 +94,13 @@ def get_suppliers_details(filters):
 				item_supplier_map.setdefault(d.item_code, []).append(d.supplier)
 
 	if supplier:
+		invalid_items = []
 		for item_code, suppliers in iteritems(item_supplier_map):
 			if supplier not in suppliers:
-				del item_supplier_map[item_code]
+				invalid_items.append(item_code)
+
+		for item_code in invalid_items:
+			del item_supplier_map[item_code]
 
 	return item_supplier_map