Uncaught TypeError: Cannot read property 'current' of undefined

[Enter steps to reproduce:]

1. ...
2. ...

**Atom**: 1.58.0 x64
**Electron**: 9.4.4
**OS**: Microsoft Windows 10 Home
**Thrown From**: [ide-python](https://github.com/lgeiger/ide-python) package 1.9.7

### Stack Trace

Uncaught TypeError: Cannot read property 'current' of undefined

```
At C:\Users\adghr\.atom\packages\ide-python\node_modules\react-dom\cjs\react-dom.production.min.js:250

TypeError: Cannot read property 'current' of undefined
at Pj (/packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:250:24)
at Tj (/packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:250:104)
at Lj (/packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:243:163)
at Jg (/packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:237:175)
at lk (/packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:285:27)
at /packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:289:301
at Xj (/packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:244:244)
at tk (/packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:289:287)
at Object.exports.render (/packages/ide-python/node_modules/react-dom/cjs/react-dom.production.min.js:296:69)
at HTMLElement.connectedCallback (/packages/atom-ide-debugger/node_modules/@atom-ide-community/nuclide-commons-ui/ReactMountRootElement.js:64:23)
at HTMLElement.activeItemChanged (/app.asar/src/pane-element.js:152:22)
at Function.simpleDispatch (~/AppData/Local/atom/app-1.58.0/resources/app/static/:11:1186925)
at Emitter.emit (~/AppData/Local/atom/app-1.58.0/resources/app/static/:11:1188366)
at Pane.setActiveItem (~/AppData/Local/atom/app-1.58.0/resources/app/static/:11:458925)
at Pane.activateItem (~/AppData/Local/atom/app-1.58.0/resources/app/static/:11:461173)
at DebuggerLayoutManager._appendItemToDock (/packages/atom-ide-debugger/dist/ui/DebuggerLayoutManager.js:323:20)
at DebuggerLayoutManager._addPaneContainerToWorkspace (/packages/atom-ide-debugger/dist/ui/DebuggerLayoutManager.js:648:10)
at DebuggerLayoutManager.showDebuggerViews (/packages/atom-ide-debugger/dist/ui/DebuggerLayoutManager.js:593:44)
at /packages/atom-ide-debugger/dist/main.js:412:24)
at CommandRegistry.handleCommandEvent (~/AppData/Local/atom/app-1.58.0/resources/app/static/:11:352326)
at CommandRegistry.dispatch (~/AppData/Local/atom/app-1.58.0/resources/app/static/:11:350801)
at BreakpointDisplayController._handleGutterClick (/packages/atom-ide-debugger/dist/BreakpointDisplayController.js:316:25)
```

### Commands

```
-1:55.1.0 core:paste (input.hidden-input)
8x -1:20.2.0 core:backspace (input.hidden-input)
-0:18.8.0 debugger:show (atom-workspace.workspace.scrollbars-visible-always.theme-one-dark-syntax.theme-one-dark-ui)
```

### Non-Core Packages

```
atom-ide-base 3.4.0
atom-ide-code-format 1.0.2
atom-ide-console 0.0.2
atom-ide-datatip 0.25.0
atom-ide-debugger 0.0.3
atom-ide-definitions 0.4.2
atom-ide-hyperclick 1.0.11
atom-ide-markdown-service 2.1.0
atom-ide-outline 3.2.0
atom-ide-signature-help 0.16.0
atom-material-ui 2.1.3
atom-python-run 0.9.7
busy-signal 2.0.1
Hydrogen 2.16.3
ide-python 1.9.7
intentions 2.1.1
linter 3.4.0
linter-ui-default 3.4.1
python-tools 0.6.9
script 3.32.2
zentabs 0.8.9
```

Bắt đầu bằng cách tái hiện lỗi với lệnh debugger:show đã được báo cáo sau khi nhấp vào gutter, sau đó lần theo stack qua DebuggerLayoutManager._appendItemToDock và ReactMountRootElement.js:64. So sánh các phiên bản đã cài đặt của ide-python, atom-ide-debugger và React; hoàn tất khi chế độ xem debugger mở mà không gặp TypeError chưa được bắt trong môi trường đã báo cáo.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.