Exception after bench migrate - KeyError: 'custom_fields'

Then I tried write the bench migrate, i took exception:

File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/emil/Desktop/frappe-bench/apps/frappe/frappe/utils/bench_helper.py", line 97, in <module>
    main()
  File "/home/emil/Desktop/frappe-bench/apps/frappe/frappe/utils/bench_helper.py", line 18, in main
    click.Group(commands=commands)(prog_name='bench')
  File "/home/emil/Desktop/frappe-bench/env/lib/python3.6/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/emil/Desktop/frappe-bench/env/lib/python3.6/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/emil/Desktop/frappe-bench/env/lib/python3.6/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/emil/Desktop/frappe-bench/env/lib/python3.6/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/emil/Desktop/frappe-bench/env/lib/python3.6/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/emil/Desktop/frappe-bench/env/lib/python3.6/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/emil/Desktop/frappe-bench/env/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/emil/Desktop/frappe-bench/apps/frappe/frappe/commands/__init__.py", line 25, in _func
    ret = f(frappe._dict(ctx.obj), *args, **kwargs)
  File "/home/emil/Desktop/frappe-bench/apps/frappe/frappe/commands/site.py", line 227, in migrate
    migrate(context.verbose, rebuild_website=rebuild_website)
  File "/home/emil/Desktop/frappe-bench/apps/frappe/frappe/migrate.py", line 52, in migrate
    sync_customizations()
  File "/home/emil/Desktop/frappe-bench/apps/frappe/frappe/modules/utils.py", line 98, in sync_customizations
    sync_customizations_for_doctype(data, folder)
  File "/home/emil/Desktop/frappe-bench/apps/frappe/frappe/modules/utils.py", line 125, in sync_customizations_for_doctype
    if data['custom_fields']:
KeyError: 'custom_fields'

Is it linked with my custom_fields in doctypes and how to check why data isn’t contains my custom fields?