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The list is an object, with the keys being the different element id’s – you are currently trying to access like this:
this.$store.state.product.list.id.name
You are getting that error because there is no id key in the list object, you need to replace .id with the actual id value, like this:
this.$store.state.product.list["12"].name; //"Bunga Gandeng"
Source:stackexchange.com