UMI 升级到 3.4.25 会出现错误

[limaofeng]

Cannot read property 'files' of undefined
TypeError: Cannot read property 'files' of undefined
    at Object.<anonymous> (/Users/limaofeng/Workspace/github/UMIExpoExample/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/generateFiles/core/routes.js:75:12)
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (/Users/limaofeng/Workspace/github/UMIExpoExample/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/generateFiles/core/routes.js:62:103)
    at _next (/Users/limaofeng/Workspace/github/UMIExpoExample/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/generateFiles/core/routes.js:64:194)
    at /Users/limaofeng/Workspace/github/UMIExpoExample/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/generateFiles/core/routes.js:64:364
    at new Promise (<anonymous>)
    at Object.<anonymous> (/Users/limaofeng/Workspace/github/UMIExpoExample/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/generateFiles/core/routes.js:64:97)
    at Object.fn (/Users/limaofeng/Workspace/github/UMIExpoExample/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/generateFiles/core/routes.js:103:19)
    at /Users/limaofeng/Workspace/github/UMIExpoExample/node_modules/@umijs/core/lib/Service/Service.js:609:28