Clicking on the add node will report an error ：observeArray undefined

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Uncaught TypeError: Cannot read property 'observeArray' of undefined
at Proxy.mutator (vue.esm.js?915d:889)
at eval (mindmap.umd.min.js?d613:1)
at t.e.produce (mindmap.umd.min.js?d613:1)
at t.value (mindmap.umd.min.js?d613:1)
at VueComponent.add (mindmap.umd.min.js?d613:1)
at VueComponent.gBtnClick (mindmap.umd.min.js?d613:1)
at SVGGElement.eval (mindmap.umd.min.js?d613:1)

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Probably made my own Node package problem ，run directly./dist/index.html without error