我正在使用Chartjs创建一个图表，该图表显示数据库中存在的信息，尽管显示了信息，但我一直收到以下错误：

vue.runtime.esm.js?2b0e:619 [Vue warn]: Error in created hook (Promise/async): "TypeError: Cannot read property 'position' of undefined"
    found in
    ---> <Reports> at src/views/Reports.vue
           <VMain>
             <VApp>
               <Navbar> at src/layout/Navbar.vue
                 <App> at src/App.vue
                   <Root>

还有这个：

TypeError: Cannot read property 'position' of undefined
        at _callee$ (Reports.vue?0011:53)
        at tryCatch (runtime.js?96cf:63)
        at Generator.invoke [as _invoke] (runtime.js?96cf:294)
        at Generator.eval [as next] (runtime.js?96cf:119)
        at asyncGeneratorStep (asyncToGenerator.js?1da1:3)
        at _next (asyncToGenerator.js?1da1:25)

该错误将我指向此函数，在此函数中，我将信息传递给图表

async created() {
        const {
            data
        } = await axios.get("http://localhost:4000/users");
        var c = 0
        for (var i = 0; i < 1000; i++) {
            if (data[i].position in this.labels) {
                continue
            } else {
                this.labels.push(data[i].position)
                this.confirmed.push(data[i].id)
                c = c + 1
                if (c == 28) {
                    break
                }
            }
        }
        console.log(this.labels)
    }

注：我的数据库包括列位置、ID和名称。