message: added logic to assert `meta` prop exists before trying to update it
diff: @@ -144,6 +144,7 @@ class Authentication {
  let m = bearerTokenPattern.exec(ctxt.header['authorization']);
  if (m) {
  + ctxt.body.data.meta = ctxt.body.data.meta || {};
  ctxt.body.data.meta['prevToken'] = m[1];
  }
  });
  