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Creator 版本： 3.0.0
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目标平台：
参考：https://docs.cocos.com/creator/manual/zh/advanced-topics/engine-customization.html
基于 3.0.0 的分支，新增了一个 方法
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重现方式：自定义后无法打开 IDE，启动报错。然后就无法重启，重置以后才正常，但引擎定制失败
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首个报错： 参考下图，然后无法打开
- 之前哪个版本是正常的：
- 手机型号：
- 手机浏览器：
- 编辑器操作系统：
- 重现概率：
其他信息
TypeError: Cannot read property 'webContents' of null
at Object.sendToWin (/Applications/CocosCreator/Creator/3.0.0/CocosCreator.app/Contents/Resources/app.asar/node_modules/@base/electron-base-ipc/dist/browser.ccc:1:1611)
at Object.sendToWin (/Applications/CocosCreator/Creator/3.0.0/CocosCreator.app/Contents/Resources/app.asar/node_modules/@base/electron-base-ipc/dist/index.js:1:331)
at Object.broadcast (/Applications/CocosCreator/Creator/3.0.0/CocosCreator.app/Contents/Resources/app.asar/lib/dist/message/browser/index.ccc:1:2100)
at Object.broadcast (/Applications/CocosCreator/Creator/3.0.0/CocosCreator.app/Contents/Resources/app.asar/lib/dist/message/index.ccc:1:736)
at ShortcutManager.<anonymous> (/Applications/CocosCreator/Creator/3.0.0/CocosCreator.app/Contents/Resources/app.asar/builtin/shortcuts/dist/browser/shortcut-manager.ccc:1:214)
at invokeFunc (/Applications/CocosCreator/Creator/3.0.0/CocosCreator.app/Contents/Resources/app.asar/node_modules/lodash/lodash.js:10333:23)
at trailingEdge (/Applications/CocosCreator/Creator/3.0.0/CocosCreator.app/Contents/Resources/app.asar/node_modules/lodash/lodash.js:10382:18)
at Timeout.timerExpired [as _onTimeout] (/Applications/CocosCreator/Creator/3.0.0/CocosCreator.app/Contents/Resources/app.asar/node_modules/lodash/lodash.js:10370:18)
at listOnTimeout (internal/timers.js:549:17)
at processTimers (internal/timers.js:492:7)```