React Redux State on direct link call

Question

I´m using Redux for a Global State Object currentUser.

Everything is working as expected but I´m quite unsure on how to handle state when nothing yet is there.

Means I try to set the State dynamic on direct link call (e.g. localhost:port/users/id) if current User is empty on this time but I get an Error "Cannot read properties of undefined (reading State).

API Call is working as expected aswell.

Code:

Call Fetch if currentUser is not set (which is the case on direct link call):

const currentUser = useSelector((state => state.getCurrentUser.user))
const dispatch = useDispatch()

useEffect(() => {
        restAPI("get", hostAPI + window.location.pathname)
            .then(data => setHours(data))
            .catch(() => console.log("Something went wrong...."))
        if(!currentUser.id) {
            let num = window.location.pathname.match(/\d+/g);
            dispatch(getCurrentUser())
        }
    }, [])

if(currentUser.length) {
render(
....
)
}

getCurrentUserSlice:

import {createSlice} from "@reduxjs/toolkit";
import {createAsyncThunk} from "@reduxjs/toolkit";
import {hostAPI} from "../../api/env_dev";
import {restAPI} from "../../api/restAPI";
import {currentUserSlice} from "../user/currentUserSlice";

export const getCurrentUser = createAsyncThunk(
    "users/getCurrentUser",
    async (dispatch, getState) => {
        return await restAPI("get", hostAPI + "/profile/1")
    }
)

const getCurrentUserSlice = createSlice({
    name: "getCurrentUser",
    initialState: {
        user: [""],
        status: null
    },
    reducers: {
        addCurrentUser: (state, action) => {
            state.user = action.payload
        }
    },
    extraReducers: {
        [getCurrentUser.pending]: (state, action) => {
            state.status = "loading"
        },
        [getCurrentUser.fulfilled]: (state, action) => {
            state.status = "success";
            state.user = action.payload
        },
        [getCurrentUser.rejected]: (state, action) => {
            state.status = "failed"
        }
    }
})

export const {addCurrentUser} = getCurrentUserSlice.actions

export default getCurrentUserSlice.reducer;