standard: Unexpected linter output

[yf287]

*What version of standard?
v12.0.1

What operating system, Node.js, and npm version?
mac os10.13.6
node V8.12.0
npm v6.4.1

What did you expect to happen?
standard works when running 'npm run standard'.I've already writen scripts "standard": "standard" in package.json

What actually happened?
npm err:

standard

standard: Unexpected linter output:

TypeError: Cannot convert undefined or null to object
at Function.keys ()
at Object.keys (/Users/lianjia/Documents/my_code/vue-router-test/node_modules/flat-cache/cache.js:52:19)
at removeNotFoundFiles (/Users/lianjia/Documents/my_code/vue-router-test/node_modules/file-entry-cache/cache.js:18:35)
at Object.create (/Users/lianjia/Documents/my_code/vue-router-test/node_modules/file-entry-cache/cache.js:31:5)
at new LintResultCache (/Users/lianjia/Documents/my_code/vue-router-test/node_modules/standard/node_modules/eslint/lib/util/lint-result-cache.js:62:46)
at new CLIEngine (/Users/lianjia/Documents/my_code/vue-router-test/node_modules/standard/node_modules/eslint/lib/cli-engine.js:430:37)
at /Users/lianjia/Documents/my_code/vue-router-test/node_modules/standard-engine/index.js:119:16
at /Users/lianjia/Documents/my_code/vue-router-test/node_modules/deglob/index.js:51:12
at end (/Users/lianjia/Documents/my_code/vue-router-test/node_modules/run-parallel/index.js:18:15)
at done (/Users/lianjia/Documents/my_code/vue-router-test/node_modules/run-parallel/index.js:22:10)

If you think this is a bug in standard, open an issue: https://github.com/standard/standard/issues

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.