[Vuejs]-How to filter namespaced getter in Vuex module (vueJs)

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Until your SET_SHOP_ITEM_CATEGORIES mutation is executed, your getter will use whatever initial data you have in your module’s state. If that ShopItemsCategories.data property is not defined, you will get the reported error message when your computed property executes.

The simple solution is to define some initial state that makes sense for the rest of your app.

For example

state: {
  ShopItemsCategories: {
    data: []
  }
}

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