Pushing any app without env variables fails about builder HOT 2 CLOSED

$deis config:set FOO=foo 
Creating config... done

=== cheery-crawfish Config
FOO      foo

$ git push deis master                                                                                                                                                        
Counting objects: 114, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (62/62), done.
Writing objects: 100% (114/114), 23.10 KiB | 23.10 MiB/s, done.
Total 114 (delta 39), reused 114 (delta 39)
remote: Resolving deltas: 100% (39/39), done.
Starting build... but first, coffee!
-----> Restoring cache...
       No cache file found. If this is the first deploy, it will be created now.
-----> Python app detected
-----> Installing python-3.5.2
-----> Installing pip
-----> Installing requirements with pip
       Collecting Django==1.10.6 (from -r /tmp/build/requirements.txt (line 1))
       Downloading https://files.pythonhosted.org/packages/b9/bb/723f78e6f6aea78590331eba4e42b8a09c33ce154204a942525a91101d0b/Django-1.10.6-py2.py3-none-any.whl (6.8MB)
       Collecting gunicorn==19.6.0 (from -r /tmp/build/requirements.txt (line 2))
       Downloading https://files.pythonhosted.org/packages/72/de/ec28a64885e0b390063379cca601b60b1f9e51367e0c76030ac8a5cddd5e/gunicorn-19.6.0-py2.py3-none-any.whl (114kB)
       Installing collected packages: Django, gunicorn
       Successfully installed Django-1.10.6 gunicorn-19.6.0

-----> $ python manage.py collectstatic --noinput
       61 static files copied to '/tmp/build/staticfiles'.

-----> Discovering process types
       Procfile declares types -> web
-----> Checking for changes inside the cache directory...
       Files inside cache folder changed, uploading new cache...
       Done: Uploaded cache (61M)
-----> Compiled slug size is 58M
Build complete.
Launching App...
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Done, cheery-crawfish:v3 deployed to Workflow

Use 'deis open' to view this application in your browser

To learn more, use 'deis help' or visit https://deis.com/

To ssh://deis-builder.dev.xxxxxxxx:2222/cheery-crawfish.git
 * [new branch]      master -> master

$ deis open