GCE: list_nodes occasionally failing with ResourceNotFoundError when instances being deleted

I'm using libcloud version 0.18.0 (version not available in the dropdown list above)

When listing instances on GCE while I (or another user) concurrently delete instances on the same project, I occasionally get the following exception:

File "/usr/lib/python2.7/site-packages/libcloud/compute/drivers/gce.py", line 1601, in list_nodes
v.get('instances', [])]
File "/usr/lib/python2.7/site-packages/libcloud/compute/drivers/gce.py", line 5283, in _to_node
extra['boot_disk'] = self.ex_get_volume(bd['name'], bd['zone'])
File "/usr/lib/python2.7/site-packages/libcloud/compute/drivers/gce.py", line 4165, in ex_get_volume
response = self.connection.request(request, method='GET').object
File "/usr/lib/python2.7/site-packages/libcloud/compute/drivers/gce.py", line 120, in request
response = super(GCEConnection, self).request(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/libcloud/common/google.py", line 692, in request
*args, **kwargs)
File "/usr/lib/python2.7/site-packages/libcloud/common/base.py", line 799, in request
response = responseCls(**kwargs)
File "/usr/lib/python2.7/site-packages/libcloud/common/base.py", line 145, in _init_
self.object = self.parse_body()
File "/usr/lib/python2.7/site-packages/libcloud/common/google.py", line 263, in parse_body
raise ResourceNotFoundError(message, self.status, code)
libcloud.common.google.ResourceNotFoundError:

{u'domain': u'global', u'message': u"The resource 'projects/xxxx/zones/xxxx/disks/xxxx-5802f' was not found", u'reason': u'notFound'}

I think the exception should be catched in "/usr/lib/python2.7/site-packages/libcloud/compute/drivers/gce.py", line 5283 when the volume corresponding to the instance being deleted is not found.

Regards,
Colin