[Fix] Bin not deleted on delete of an item (#13539)

diff --git a/erpnext/stock/doctype/item/item.py b/erpnext/stock/doctype/item/item.py
index 9ead587..ab99eaf 100644
--- a/erpnext/stock/doctype/item/item.py
+++ b/erpnext/stock/doctype/item/item.py
@@ -506,7 +506,7 @@
 
 	def on_trash(self):
 		super(Item, self).on_trash()
-		frappe.db.sql("""delete from tabBin where item_code=%s""", self.item_code)
+		frappe.db.sql("""delete from tabBin where item_code=%s""", self.name)
 		frappe.db.sql("delete from `tabItem Price` where item_code=%s", self.name)
 		for variant_of in frappe.get_all("Item", filters={"variant_of": self.name}):
 			frappe.delete_doc("Item", variant_of.name)