Version

3.1.0-beta.3

Reproduction link

Link

Steps to reproduce

Hey Vue team - too much work to get a JSFiddle up because my example involves vuex and vue-router and an external REST api to provide a user object along with JWT. But if you read through the SFC link for my basic ProfilePage/index.vue component - you should be able to understand whats going on. The resultant warning message says to open an issue because it is likely a Vue internals bug.

Steps:

1. Hit Logout button
2. Warning appears in console

Here is my minimal auth-module.js:

const auth = {
  actions: {
    logout({commit}) {
      localStorage.removeItem("user");
      localStorage.removeItem("token");
      commit("logout");
    }
  },
  mutations: {
    logout(state) {
      state.user = null;
      state.status.loggedIn = false
    }
  }
}

What is expected?

No warning is expected.

What is actually happening?

Here are the warnings in console:

[Vue warn]: Unhandled error during execution of render function 
  at <Index onVnodeUnmounted=fn<onVnodeUnmounted> ref=Ref< 
Object {  }
 > > 
  at <RouterView> 
  at <App>

[Vue warn]: Unhandled error during execution of scheduler flush. This is likely a Vue internals bug. Please open an issue at https://new-issue.vuejs.org/?repo=vuejs/vue-next 
  at <Index onVnodeUnmounted=fn<onVnodeUnmounted> ref=Ref< 
Object {  }
 > > 
  at <RouterView> 
  at <App>

Uncaught (in promise) TypeError: $setup.user is null
    _sfc_render index.vue:4
    renderComponentRoot runtime-core.esm-bundler.js:846
    componentEffect runtime-core.esm-bundler.js:4359
    reactiveEffect reactivity.esm-bundler.js:42
    callWithErrorHandling runtime-core.esm-bundler.js:154
    flushJobs runtime-core.esm-bundler.js:384
    promise callback*queueFlush runtime-core.esm-bundler.js:286
    queueJob runtime-core.esm-bundler.js:280
    run reactivity.esm-bundler.js:183
    trigger reactivity.esm-bundler.js:189
    set2 reactivity.esm-bundler.js:300
    logout auth-module.js:75
    wrappedMutationHandler vuex.esm-bundler.js:808
    commitIterator vuex.esm-bundler.js:438
    commit vuex.esm-bundler.js:437
    _withCommit vuex.esm-bundler.js:596
    commit vuex.esm-bundler.js:436
    boundCommit vuex.esm-bundler.js:376
    commit vuex.esm-bundler.js:760
    logout auth-module.js:39
    wrappedActionHandler vuex.esm-bundler.js:815
    dispatch vuex.esm-bundler.js:488
    boundDispatch vuex.esm-bundler.js:373
    logout index.vue:29
    withModifiers runtime-dom.esm-bundler.js:1147
    callWithErrorHandling runtime-core.esm-bundler.js:154
    callWithAsyncErrorHandling runtime-core.esm-bundler.js:163
    invoker runtime-dom.esm-bundler.js:333
    addEventListener runtime-dom.esm-bundler.js:283
    patchEvent runtime-dom.esm-bundler.js:301
    patchProp runtime-dom.esm-bundler.js:369
    mountElement runtime-core.esm-bundler.js:3905
    processElement runtime-core.esm-bundler.js:3868
    patch runtime-core.esm-bundler.js:3788
    mountChildren runtime-core.esm-bundler.js:3975
    mountElement runtime-core.esm-bundler.js:3896
    processElement runtime-core.esm-bundler.js:3868
    patch runtime-core.esm-bundler.js:3788
    componentEffect runtime-core.esm-bundler.js:4298
    reactiveEffect reactivity.esm-bundler.js:42
    effect reactivity.esm-bundler.js:17
    setupRenderEffect runtime-core.esm-bundler.js:4263
    mountComponent runtime-core.esm-bundler.js:4222
    processComponent runtime-core.esm-bundler.js:4182
    patch runtime-core.esm-bundler.js:3791
    componentEffect runtime-core.esm-bundler.js:4368
    reactiveEffect reactivity.esm-bundler.js:42
    callWithErrorHandling runtime-core.esm-bundler.js:154
    flushJobs runtime-core.esm-bundler.js:384
    promise callback*queueFlush runtime-core.esm-bundler.js:286
    queueJob runtime-core.esm-bundler.js:280
    run reactivity.esm-bundler.js:183
    trigger reactivity.esm-bundler.js:189
    scheduler reactivity.esm-bundler.js:851
    run reactivity.esm-bundler.js:183
    trigger reactivity.esm-bundler.js:189

I am using vue-router@next and vuex@next

Please follow https://new-issue.vuejs.org/?repo=vuejs/vue-next#why-repro or use the forum or the Discord chat to ask questions.