chore: fix bug in unlink_asset_reference
diff --git a/erpnext/accounts/doctype/journal_entry/journal_entry.py b/erpnext/accounts/doctype/journal_entry/journal_entry.py
index 90fbd55..ac7b026 100644
--- a/erpnext/accounts/doctype/journal_entry/journal_entry.py
+++ b/erpnext/accounts/doctype/journal_entry/journal_entry.py
@@ -293,6 +293,10 @@
 					depr_schedule = get_depr_schedule_from_asset_depr_schedule_of_asset(
 						asset.name, row.finance_book
 					)
+
+					if not depr_schedule:
+						return
+
 					for s in depr_schedule:
 						if s.journal_entry == self.name:
 							s.db_set("journal_entry", None)