[ TypeError: Cannot read property 'charAt' of undefined - only during `quasar run`

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When I run quasar run I get the following error:

❯ quasar run
.../node_modules/@quasar/app/lib/app-extension/Extension.js:106
    if (name.charAt(0) === '@') {
             ^
[  TypeError: Cannot read property 'charAt' of undefined
  
  - Extension.js:106 new Extension
    [client]/[@quasar]/app/lib/app-extension/Extension.js:106:14
  
  - quasar-run:51 run
    [client]/[@quasar]/app/bin/quasar-run:51:21
  
  - quasar-run:91 Object.<anonymous>
    [client]/[@quasar]/app/bin/quasar-run:91:1
  
  - loader:1108 Module._compile
    node:internal/modules/cjs/loader:1108:14
  
  - loader:1137 Object.Module._extensions..js
    node:internal/modules/cjs/loader:1137:10
  
  - loader:973 Module.load
    node:internal/modules/cjs/loader:973:32
  
  - loader:813 Function.Module._load
    node:internal/modules/cjs/loader:813:14
  
  - loader:997 Module.require
    node:internal/modules/cjs/loader:997:19
  
  - helpers:92 require
    node:internal/modules/cjs/helpers:92:18
  
  - quasar:80 Object.<anonymous>
    [client]/[@quasar]/app/bin/quasar:80:1
  
]

But quasar build works just fine.

I’m also not sure how this happened, I’m pretty sure I haven’t made any changes since this last worked.

I’ve tried removing node_modules/ and ran quasar clean but the problem persists.

The problem occurred on both Quasar 2 beta 5 and beta 6.