"ArgumentError, invalid slice size" when only one notification is being sent

[gvarela]

I am running rpush on heroku with stock configurations. When I try to queue a single test notification I get this error. When I send multiples it seems to be fine.

Any thoughts on if this is an issue on my side or an error in the enqueue method on the app_runner?

2014-07-30T22:22:23.222745+00:00 app[rpush.1]: [2014-07-30 22:22:23] [ERROR] ArgumentError, invalid slice size
2014-07-30T22:22:23.222751+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.2/lib/active_support/core_ext/array/grouping.rb:34:in `each_slice'
2014-07-30T22:22:23.222753+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.2/lib/active_support/core_ext/array/grouping.rb:34:in `in_groups_of'
2014-07-30T22:22:23.222755+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/bundler/gems/rpush-5653cabd82f5/lib/rpush/daemon/app_runner.rb:95:in `enqueue'
2014-07-30T22:22:23.222756+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/bundler/gems/rpush-5653cabd82f5/lib/rpush/daemon/app_runner.rb:17:in `block in enqueue'
2014-07-30T22:22:23.222758+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/bundler/gems/rpush-5653cabd82f5/lib/rpush/daemon/app_runner.rb:15:in `each'
2014-07-30T22:22:23.222760+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/bundler/gems/rpush-5653cabd82f5/lib/rpush/daemon/app_runner.rb:15:in `enqueue'
2014-07-30T22:22:23.222777+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/bundler/gems/rpush-5653cabd82f5/lib/rpush/daemon/feeder.rb:43:in `enqueue_notifications'
2014-07-30T22:22:23.222779+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/bundler/gems/rpush-5653cabd82f5/lib/rpush/daemon/feeder.rb:28:in `block (2 levels) in feed_forever'
2014-07-30T22:22:23.222780+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/bundler/gems/rpush-5653cabd82f5/lib/rpush/daemon/feeder.rb:27:in `loop'
2014-07-30T22:22:23.222782+00:00 app[rpush.1]: /app/vendor/bundle/ruby/2.1.0/bundler/gems/rpush-5653cabd82f5/lib/rpush/daemon/feeder.rb:27:in `block in feed_forever'

[gvarela]

awesome thanks!