Error in regeneration of sketch file
During regeneration, I get this error:

```
app-store.ts:143 Uncaught (in promise) SyntaxError: Unexpected token : in JSON at position 1070 at parse (<anonymous>)
```

The error points here:
```
const LastSelectedRepositoryIDKey = 'last-selected-repository-id'
```

It happens with pretty much all the `sketch` files of a specific project I'm working on. What could be the cause?