diff --git a/erpnext/stock/doctype/item/item.py b/erpnext/stock/doctype/item/item.py
index 5dc97f623b3..f2ea1d88bca 100644
--- a/erpnext/stock/doctype/item/item.py
+++ b/erpnext/stock/doctype/item/item.py
@@ -488,6 +488,8 @@ class Item(WebsiteGenerator):
 	def validate_warehouse_for_reorder(self):
 		warehouse = []
 		for i in self.get("reorder_levels"):
+			if not i.warehouse_group:
+				i.warehouse_group = i.warehouse
 			if i.get("warehouse") and i.get("warehouse") not in warehouse:
 				warehouse += [i.get("warehouse")]
 			else: