Hi Gangstag,
Since both apps use Location Services, this may be the issue.
Follow the troubleshooting steps for Siri below:
iOS: Troubleshooting Siri
You can turn Location Services on for Siri by selecting Location Services Settings on the prompt, or by going to Settings > Privacy > Location Services and turning on both Location Services and Siri.
When you first use Siri with another application that uses Location Services, you will need to turn on Location Services for that application. For example, if you create a reminder to call your mom when you get home and Reminders or Siri has not been used before with Location Services, a prompt will appear saying that you will need to turn them on in Location Services Settings.
Hope this helps ...
- Judy