Fix server crash when trying to log out and already logged out

packages/worker/src/api/controllers/global/auth.js

@@ -141,7 +141,9 @@ exports.resetUpdate = async ctx => {
 }
 
 exports.logout = async ctx => {
+  if (ctx.user && ctx.user._id) {
     await platformLogout({ ctx, userId: ctx.user._id })
+  }
   ctx.body = { message: "User logged out." }
 }