Uncaught TypeError: Cannot read property 'replace' of undefined

[Enter steps to reproduce:]

1. ...
2. ...

**Atom**: 1.54.0 x64
**Electron**: 6.1.12
**OS**: Microsoft Windows 10 Home
**Thrown From**: [script](https://github.com/atom-ide-community/atom-script) package 3.29.3

### Stack Trace

Uncaught TypeError: Cannot read property 'replace' of undefined

```
At C:\Users\hp ryzen 5\.atom\packages\script\lib\runner.js:136

TypeError: Cannot read property 'replace' of undefined
at Runner.fillVarsInArg (/packages/script/lib/runner.js:136:17)
at /packages/script/lib/runner.js:167:36
at Array.map ()
at Runner.args (/packages/script/lib/runner.js:167:18)
at Runner.run (/packages/script/lib/runner.js:25:23)
at Runtime.execute (/packages/script/lib/runtime.js:79:17)
at HTMLElement.scriptRun (/packages/script/lib/script.js:98:40)
at CommandRegistry.handleCommandEvent (~/AppData/Local/atom/app-1.54.0/resources/app/static/:11:350382)
at KeymapManager.dispatchCommandEvent (~/AppData/Local/atom/app-1.54.0/resources/app/static/:11:1230982)
at KeymapManager.handleKeyboardEvent (~/AppData/Local/atom/app-1.54.0/resources/app/static/:11:1227116)
at WindowEventHandler.handleDocumentKeyEvent (~/AppData/Local/atom/app-1.54.0/resources/app/static/:11:284879)
```

### Commands

```
22x -3:50.5.0 core:backspace (input.hidden-input)
-3:17.6.0 tree-view:add-file (ol.tree-view-root.full-menu.list-tree.has-collapsable-children.focusable-panel)
-3:13.9.0 core:confirm (input.hidden-input)
5x -3:08.6.0 core:backspace (input.hidden-input)
-2:55.1.0 editor:newline (input.hidden-input)
2x -2:48.8.0 core:move-right (input.hidden-input)
2x -2:47.4.0 editor:newline (input.hidden-input)
2x -2:28.1.0 core:move-right (input.hidden-input)
-2:21.7.0 core:save (input.hidden-input)
-2:15.3.0 fuzzy-finder:toggle-git-status-finder (input.hidden-input)
-1:50.1.0 settings-view:open (div.tool-panel.tree-view)
-0:14.9.0 script:run (input.hidden-input)
```

### Non-Core Packages

```
gpp-compiler 3.0.7
script 3.29.3
```