关尔先生

# 同样的问题 [codesandbox 代码重现 ](https://codesandbox.io/p/github/ZhengXinquan/test-umi-keepalive/csb-fpesid/draft/jovial-gwen?file=%2Fsrc%2Fpages%2FHome%2Findex.tsx&workspace=%257B%2522activeFileId%2522%253A%2522cl7kap642000floit010r1hu6%2522%252C%2522openFiles%2522%253A%255B%2522%252FREADME.md%2522%255D%252C%2522sidebarPanel%2522%253A%2522EXPLORER%2522%252C%2522gitSidebarPanel%2522%253A%2522COMMIT%2522%252C%2522sidekickItems%2522%253A%255B%257B%2522type%2522%253A%2522PREVIEW%2522%252C%2522taskId%2522%253A%2522dev%2522%252C%2522port%2522%253A8000%252C%2522key%2522%253A%2522cl7kaqbwy00bi356h5hmzzy7v%2522%252C%2522isMinimized%2522%253Afalse%252C%2522path%2522%253A%2522%252Fhome%2522%257D%252C%257B%2522type%2522%253A%2522TASK_LOG%2522%252C%2522taskId%2522%253A%2522dev%2522%252C%2522key%2522%253A%2522cl7kaq6pe006w356hj8tj8j9y%2522%252C%2522isMinimized%2522%253Afalse%257D%255D%257D) ## 描述： `"@umijs/max": "^4.0.17"` 使用 `useMode` 报错： `TypeError: Cannot read properties of null (reading 'dispatcher')` 或 `TypeError: _useContext is null` ## 操作： $ mkdir myapp...