Erro no comando "ng new"

ng -new alurapic

Cannot read property 'length' of undefined
TypeError: Cannot read property 'length' of undefined
    at levenshtein (C:\Users\Bernardo\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js:58:23)
    at listAllCommandNames.sort (C:\Users\Bernardo\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js:69:43)
    at Array.sort (native)
    at Object.<anonymous> (C:\Users\Bernardo\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js:67:65)
    at Generator.next (<anonymous>)
    at C:\Users\Bernardo\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (C:\Users\Bernardo\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js:3:12)
    at Object.runCommand (C:\Users\Bernardo\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js:28:12)
    at C:\Users\Bernardo\AppData\Roaming\npm\node_modules\@angular\cli\lib\cli\index.js:60:58

Versões

Angular CLI: 6.0.7
Node: 8.11.2
OS: win32 x64
Angular:
...

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.6.7
@angular-devkit/core         0.6.7
@angular-devkit/schematics   0.6.7
@schematics/angular          0.6.7
@schematics/update           0.6.7
rxjs                         6.6.6
typescript                   2.7.2

Alguém sabe o que pode ser?