email save throws an error

In trying out the new gmail OAuth method, I notice that I can save credentials once with no problem, and after that I get the error below. The creds seem to save in spite of the error.

Error: Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 136, in call_method
result = await self.middleware._call(message['method'], serviceobj, methodobj, params, app=self,
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1200, in _call
return await methodobj(*prepared_call.args)
File "/usr/lib/python3/dist-packages/middlewared/service.py", line 362, in update
rv = await self.middleware._call(
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1200, in _call
return await methodobj(*prepared_call.args)
File "/usr/lib/python3/dist-packages/middlewared/schema.py", line 991, in nf
return await f(*args, **kwargs)
File "/usr/lib/python3/dist-packages/middlewared/plugins/mail.py", line 170, in do_update
await self.middleware.call('mail.gmail_initialize')
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1242, in call
return await self._call(
File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1200, in _call
return await methodobj(*prepared_call.args)
File "/usr/lib/python3/dist-packages/middlewared/plugins/mail_/gmail.py", line 30, in gmail_initialize
self.gmail_service.close()
File "/usr/lib/python3/dist-packages/middlewared/plugins/mail_/gmail.py", line 20, in close
self.service.close()
AttributeError: 'Resource' object has no attribute 'close'