"A state mutation was detected inside a dispatch " error after update to immer 7.0.0

🙋‍♂ Question

I have this code, which was working well after updating to immer 7.0.0

const accountsSlice = createSlice({
  name: 'accounts',
  initialState,
  reducers: {
    fetchAccountsInit(state) {
      return produce(state, (draft) => {
        draft.status.isFetching = true;
        draft.errors.fetching = [];
      });
    },
...

Today I updated the immer to 7.0.0 and I’m getting this error:

Unhandled Rejection (Error): Invariant failed: A state mutation was detected inside a dispatch, in the path: accounts.errors.fetching. Take a look at the reducer(s) handling the action {"type":"accounts/fetchAccountsInit"}. (http://redux.js.org/docs/Troubleshooting.html#never-mutate-reducer-arguments)

On Github releases page, I found this :

[BREAKING CHANGE] produce no longer accepts non-draftable objects as first argument

What am I doing wrong there?

It’s related? Is there a migration guide since there are tons of breaking changes? I couldn’t find a migration guide on the website.