Lint leads to server error

Trying to validate:
```
travis lint ../.travis.yml
```
Getting:
```
server error (500: "Sorry, we experienced an error.\n\nrequest_id:5e9be46f-56c6-4471-a2a2-c169b02c560a\n")
```
Configuration:
>ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin19]