Hexo 出现 Cannot read property '1' of undefined

在使用 Hexo-2.8.3 命令 hexo g 生成 HTML 页面时出现 TypeError: Cannot read property ‘1’ of undefined ，错误信息如下

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[error] HexoError: Process failed: _posts/OS-X-Yosemite.md
TypeError: Cannot read property '1' of undefined
    at /usr/local/lib/node_modules/hexo/lib/plugins/filter/backtick_code_block.js:32:27
    at String.replace (native)
    at module.exports (/usr/local/lib/node_modules/hexo/lib/plugins/filter/backtick_code_block.js:14:31)
    at /usr/local/lib/node_modules/hexo/lib/post/render.js:77:9
    at iterate (/usr/local/lib/node_modules/hexo/node_modules/async/lib/async.js:149:13)
    at Object.async.eachSeries (/usr/local/lib/node_modules/hexo/node_modules/async/lib/async.js:165:9)
    at async.series.options (/usr/local/lib/node_modules/hexo/lib/post/render.js:76:13)
    at /usr/local/lib/node_modules/hexo/node_modules/async/lib/async.js:610:21
    at /usr/local/lib/node_modules/hexo/node_modules/async/lib/async.js:249:17
    at iterate (/usr/local/lib/node_modules/hexo/node_modules/async/lib/async.js:149:13)

经排查发现是因为在使用 Markdown 代码区块语法后面多了一个空格

生成 HTML 成功

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```#这里没有空格
code
...

生成 HTML 出错

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``` #前面多了一个空格
code
...

完。