small fix

src/redux/slices/userSlice.ts

@@ -27,17 +27,21 @@ export const userSlice = createSlice({
         (restaurant) => restaurant.id === action.payload.id
       );
       let restaurants: Restaurant[] = state.restaurants || [];
-      state = {
-        ...state,
-        restaurants: [
-          ...restaurants.slice(0, index),
-          action.payload,
-          ...restaurants.slice(index + 1),
-        ],
-      };
+      if (index != undefined) {
+        state = {
+          ...state,
+          restaurants: [
+            ...restaurants.slice(0, index),
+            action.payload,
+            ...restaurants.slice(index + 1),
+          ],
+        };
+      } else {
+        state = state;
+      }
     },
   },
 });
 
-export const { clearUserData } = userSlice.actions;
+export const { clearUserData, updateRestaurant } = userSlice.actions;
 export default userSlice.reducer;