[BUG] Scheduled Job `run_sales_orders_sync` fails sometimes

[dvdl16]

Current Behavior

sync_sales_orders.run_sales_orders_sync fails intermittently, see traceback below

Steps To Reproduce

See failed logs under Scheduled Job Log

Expected Behavior

Job should complete successfully

Anything else?

Traceback with variables (most recent call last):
  File "apps/frappe/frappe/core/doctype/scheduled_job_type/scheduled_job_type.py", line 143, in execute
    frappe.get_attr(self.method)()
      self = <ScheduledJobType: sync_sales_orders.run_sales_orders_sync>
  File "apps/frappe/frappe/utils/typing_validations.py", line 31, in wrapper
    return func(*args, **kwargs)
      args = ()
      kwargs = {}
      apply_condition = <function whitelist.<locals>.innerfn.<locals>.<lambda> at 0x725d30eee520>
      func = <function run_sales_orders_sync at 0x725d30eee480>
  File "apps/woocommerce_fusion/woocommerce_fusion/tasks/sync_sales_orders.py", line 50, in run_sales_orders_sync
    sync.run()
      sales_order_name = None
      woocommerce_order_id = None
      sync = <woocommerce_fusion.tasks.sync_sales_orders.SynchroniseSalesOrders object at 0x725d31067d90>
  File "apps/woocommerce_fusion/woocommerce_fusion/tasks/sync_sales_orders.py", line 101, in run
    self.sync_wc_orders_with_erpnext_sales_orders()
      self = <woocommerce_fusion.tasks.sync_sales_orders.SynchroniseSalesOrders object at 0x725d31067d90>
  File "apps/woocommerce_fusion/woocommerce_fusion/tasks/sync_sales_orders.py", line 283, in sync_wc_orders_with_erpnext_sales_orders
    wc_settings.save()
      self = <woocommerce_fusion.tasks.sync_sales_orders.SynchroniseSalesOrders object at 0x725d31067d90>

Environment and Versions

Agriculture: v0.0.1
Customisations for [redacted]: v1.2.3
South Africa Customisations: v0.1.6
ERPNext: v15.27.7
Frappe Framework: v15.29.2
Frappe HR: v15.22.3
WooCommerce Fusion: v1.5.2

Operating System

Windows

What browsers are you seeing the problem on?

Firefox