vuepress-plugin-mathjax not compatibled with vuepress-next

[artjourney]

Use vuepress dev docs compiled error.

TypeError [ERR_INVALID_ARG_TYPE]: The "from" argument must be of type string. Received undefined
at validateString (internal/validators.js:124:11)
at Object.relative (path.js:492:5)
at module.exports (D:\docs-beta\node_modules\vuepress-plugin-mathjax\src\tex2html.js:68:14)
at module.exports.mergeable.macros (D:\docs-beta\node_modules\vuepress-plugin-mathjax\src\index.js:8:29)
at D:\docs-beta\node_modules\vuepress-mergeable\lib\index.js:13:16
at Object.resolvePlugin (D:\docs-beta\node_modules@vuepress\core\lib\app\resolvePlugin.js:18:11)
at D:\docs-beta\node_modules@vuepress\core\lib\app\resolvePluginsFromConfig.js:12:35
at Array.reduce ()
at Object.resolvePluginsFromConfig (D:\docs-beta\node_modules@vuepress\core\lib\app\resolvePluginsFromConfig.js:9:65)
at Object.createBaseApp (D:\docs-beta\node_modules@vuepress\core\lib\app\createBaseApp.js:47:48)
at Object.createDevApp (D:\docs-beta\node_modules@vuepress\core\lib\app\createDevApp.js:10:33)
at dev (D:\docs-beta\node_modules@vuepress\cli\lib\commands\dev\createDev.js:27:28)
error Command failed with exit code 1.