TypeError: Cannot read property '_leaveCb' of null

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TypeError: Cannot read property '_leaveCb' of null
    at Object.beforeEnter (https://04mrv.sse.codesandbox.io/@modules/vue.js:5176:33)
    at mountElement (https://04mrv.sse.codesandbox.io/@modules/vue.js:4020:28)
    at processElement (https://04mrv.sse.codesandbox.io/@modules/vue.js:3967:13)
    at patch (https://04mrv.sse.codesandbox.io/@modules/vue.js:3880:21)
    at componentEffect (https://04mrv.sse.codesandbox.io/@modules/vue.js:4343:21)
    at reactiveEffect (https://04mrv.sse.codesandbox.io/@modules/vue.js:295:24)
    at effect (https://04mrv.sse.codesandbox.io/@modules/vue.js:270:9)
    at setupRenderEffect (https://04mrv.sse.codesandbox.io/@modules/vue.js:4309:27)
    at mountComponent (https://04mrv.sse.codesandbox.io/@modules/vue.js:4267:9)
    at processComponent (https://04mrv.sse.codesandbox.io/@modules/vue.js:4223:17)