java.util.ConcurrentModificationException`
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1441)
at java.util.HashMap$ValueIterator.next(HashMap.java:1470)
at com.airbnb.rxgroups.ObservableGroup.forAllObservables(ObservableGroup.java:182)
at com.airbnb.rxgroups.ObservableGroup.unlock(ObservableGroup.java:216)
at com.airbnb.rxgroups.GroupLifecycleManager.unlock(GroupLifecycleManager.java:210)
at com.airbnb.rxgroups.GroupLifecycleManager.onResume(GroupLifecycleManager.java:197)
Fix for the following exception
@rossbacher