Redux RXJS订阅主题-操作必须是普通对象。使用自定义中间件进行异步操作

我想订阅一个主题。这在第一次按预期工作，但在第二次抛出上面的错误，我不知道在哪里修复它

export function uploadSceneFile(action$, store) {
  return action$.ofType(CREATE_SCENE_SUCCESS)
    .mergeMap(({payload}) =>
      UploadSceneWithFile(payload)
        .map(res => {
          if (res.progress > 0){
              return { type: UPLOAD_SCENE_PROGRESS, scene: res }
          }
          else if(res.progress === -1){
              return { type: UPLOAD_SCENE_SUCCESS, scene: res }
          }
        })
    )
}

它被设计为监听正在创建的场景，发送上传进度通知，然后发送成功消息

该错误在第二次运行时直接从该行抛出

onProgress：（val）=>subject$.next（{…场景，进度：val}）

错误消息

   Subscriber.js:242 Uncaught Error: Actions must be plain objects. Use custom middleware for async actions.
    at Object.performAction (<anonymous>:1:40841)
    at liftAction (<anonymous>:1:34377)
    at dispatch (<anonymous>:1:38408)
    at createEpicMiddleware.js:59
    at createEpicMiddleware.js:59
    at SafeSubscriber.dispatch [as _next] (applyMiddleware.js:35)
    at SafeSubscriber../node_modules/rxjs/Subscriber.js.SafeSubscriber.__tryOrUnsub (Subscriber.js:238)
    at SafeSubscriber../node_modules/rxjs/Subscriber.js.SafeSubscriber.next (Subscriber.js:185)
    at Subscriber../node_modules/rxjs/Subscriber.js.Subscriber._next (Subscriber.js:125)
    at Subscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at SwitchMapSubscriber../node_modules/rxjs/operators/switchMap.js.SwitchMapSubscriber.notifyNext (switchMap.js:126)
    at InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber._next (InnerSubscriber.js:23)
    at InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at MergeMapSubscriber../node_modules/rxjs/operators/mergeMap.js.MergeMapSubscriber.notifyNext (mergeMap.js:145)
    at InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber._next (InnerSubscriber.js:23)
    at InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at MergeMapSubscriber../node_modules/rxjs/operators/mergeMap.js.MergeMapSubscriber.notifyNext (mergeMap.js:145)
    at InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber._next (InnerSubscriber.js:23)
    at InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at MapSubscriber../node_modules/rxjs/operators/map.js.MapSubscriber._next (map.js:85)
    at MapSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at Subject../node_modules/rxjs/Subject.js.Subject.next (Subject.js:55)
    at S3Upload.onProgress (uploadSceneFile.js:27)
    at S3Upload.<anonymous> (s3upload.js:139)

Subscriber.js:242未捕获错误：操作必须是普通对象。使用自定义中间件进行异步操作。
在对象执行时（：1:40841）
提升时（：1:34377）
调度时（：1:38408）
在createEpicMiddleware.js:59
在createEpicMiddleware.js:59
SafeSubscriber.dispatch[as_next]（applyMiddleware.js:35）
在SafeSubscriber../node_modules/rxjs/Subscriber.js.SafeSubscriber.\uu tryOrUnsub（Subscriber.js:238）
在SafeSubscriber../node_modules/rxjs/Subscriber.js.SafeSubscriber.next（Subscriber.js:185）
在Subscriber../node_modules/rxjs/Subscriber.js.Subscriber.\u next（Subscriber.js:125）
在订阅服务器处../node_modules/rxjs/Subscriber.js.Subscriber.next（Subscriber.js:89）
在SwitchMapSubscriber../node_modules/rxjs/operators/switchMap.js.SwitchMapSubscriber.notifyNext（switchMap.js:126）
在InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber.\u下一步（InnerSubscriber.js:23）
在InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next（Subscriber.js:89）
在MergeMapSubscriber../node_modules/rxjs/operators/mergeMap.js.MergeMapSubscriber.notifyNext（mergeMap.js:145）
在InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber.\u下一步（InnerSubscriber.js:23）
在InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next（Subscriber.js:89）
在MergeMapSubscriber../node_modules/rxjs/operators/mergeMap.js.MergeMapSubscriber.notifyNext（mergeMap.js:145）
在InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber.\u下一步（InnerSubscriber.js:23）
在InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next（Subscriber.js:89）
在MapSubscriber../node\u modules/rxjs/operators/map.js.MapSubscriber.\u next（map.js:85）
在MapSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next（Subscriber.js:89）
在Subject../node_modules/rxjs/Subject.js.Subject.next（Subject.js:55）
在S3Upload.onProgress（uploadSceneFile.js:27）
在S3Upload。（s3upload.js:139）

在您的

上传场景文件
的内部
映射中，您有一个
if
语句，后跟一个
else if
语句，如果两者都不是
true
，
映射将返回
未定义的
，而不是操作

.map（res=>{
如果（恢复进度>0）{
返回{type:UPLOAD\u SCENE\u PROGRESS，SCENE:res}
}
else if（res.progress==-1）{
返回{type:UPLOAD\u SCENE\u SUCCESS，SCENE:res}
}
//这里应该返回一个操作！
})

请注意，当传递
未定义的
操作时，确定某个动作是否为普通对象的方法将影响您看到的错误。
在内部
映射中有
if
和
else if
-在
上传场景文件中
-那么它是否可能返回
未定义的
？我爱你。似乎奏效了。。把它作为答案，我会把它标对的。（我添加了一个未定义的返回操作，它似乎使错误消失了）
   Subscriber.js:242 Uncaught Error: Actions must be plain objects. Use custom middleware for async actions.
    at Object.performAction (<anonymous>:1:40841)
    at liftAction (<anonymous>:1:34377)
    at dispatch (<anonymous>:1:38408)
    at createEpicMiddleware.js:59
    at createEpicMiddleware.js:59
    at SafeSubscriber.dispatch [as _next] (applyMiddleware.js:35)
    at SafeSubscriber../node_modules/rxjs/Subscriber.js.SafeSubscriber.__tryOrUnsub (Subscriber.js:238)
    at SafeSubscriber../node_modules/rxjs/Subscriber.js.SafeSubscriber.next (Subscriber.js:185)
    at Subscriber../node_modules/rxjs/Subscriber.js.Subscriber._next (Subscriber.js:125)
    at Subscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at SwitchMapSubscriber../node_modules/rxjs/operators/switchMap.js.SwitchMapSubscriber.notifyNext (switchMap.js:126)
    at InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber._next (InnerSubscriber.js:23)
    at InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at MergeMapSubscriber../node_modules/rxjs/operators/mergeMap.js.MergeMapSubscriber.notifyNext (mergeMap.js:145)
    at InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber._next (InnerSubscriber.js:23)
    at InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at MergeMapSubscriber../node_modules/rxjs/operators/mergeMap.js.MergeMapSubscriber.notifyNext (mergeMap.js:145)
    at InnerSubscriber../node_modules/rxjs/InnerSubscriber.js.InnerSubscriber._next (InnerSubscriber.js:23)
    at InnerSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at MapSubscriber../node_modules/rxjs/operators/map.js.MapSubscriber._next (map.js:85)
    at MapSubscriber../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at Subject../node_modules/rxjs/Subject.js.Subject.next (Subject.js:55)
    at S3Upload.onProgress (uploadSceneFile.js:27)
    at S3Upload.<anonymous> (s3upload.js:139)