### Steps to reproduce
What we need to do to see your problem or bug?

The more detailed the issue, the more likely that we will fix it ASAP.

Don't use GitHub issues for questions like "How can I do that?" —
use [StackOverflow](https://stackoverflow.com/questions/tagged/doorkeeper)
instead with the corresponding tag.

### Expected behavior
Tell us what should happen

### Actual behavior
Tell us what happens instead

### System configuration
You can help us to understand your problem if you will share some very
useful information about your project environment (don't forget to
remove any confidential data if it exists).

**Doorkeeper initializer**:

**Ruby version**:

**Gemfile.lock**: