fix: get_previous_allocation return value

erpnext/hr/doctype/leave_allocation/leave_allocation.py

@@ -297,7 +297,7 @@ def create_leave_ledger_entry(self, submit=True):
 def get_previous_allocation(from_date, leave_type, employee):
 	"""Returns document properties of previous allocation"""
 	Allocation = frappe.qb.DocType("Leave Allocation")
-	return (
+	allocations = (
 		frappe.qb.from_(Allocation)
 		.select(
 			Allocation.name,
@@ -313,8 +313,11 @@ def get_previous_allocation(from_date, leave_type, employee):
 			& (Allocation.docstatus == 1)
 		)
 		.orderby(Allocation.to_date, order=frappe.qb.desc)
+		.limit(1)
 	).run(as_dict=True)
 
+	return allocations[0] if allocations else None
+
 
 def get_leave_allocation_for_period(
 	employee, leave_type, from_date, to_date, exclude_allocation=None