Error when trimming auth cache in apihelper / core container

ERROR:root:Exception calling application: 'xosadmin@opencord.org:XXXJgqhzks5kBIbxN8Qd'
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/grpc/_server.py", line 364, in _call_behavior
    return behavior(argument, context), True
  File "/opt/xos/coreapi/apihelper.py", line 24, in wrapper
    return function(*args, **kwargs)
  File "/opt/xos/coreapi/xos_grpc_api.py", line 3912, in FilterControllerUser
    user=self.authenticate(context)
  File "/opt/xos/coreapi/apihelper.py", line 361, in authenticate
    user = cached_authenticator.authenticate(username=username, password=password)
  File "/opt/xos/coreapi/apihelper.py", line 73, in authenticate
    self.trim()
  File "/opt/xos/coreapi/apihelper.py", line 95, in trim
    del self.cached_creds[k]
KeyError: 'xosadmin@opencord.org:XXXJgqhzks5kBIbxN8Qd'