[Vuejs]-Getting a Vue warning TypeError: Cannot read property of undefined but the data is present

The problem might be the computed property for itemName.
If this.myAssets is empty or does not contain the correct item find() in getAssetId returns undefined (https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Array/find).
getAssetId is used in the computed property for itemNamewhere you are trying access itemName of undefined.