java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.TreeMap$MapIterator.stepForward(TreeMap.java:883)
at java.util.TreeMap$KeySet$1.next(TreeMap.java:959)
at com.mikepenz.fastadapter.FastAdapter.collapse(FastAdapter.java:986)
at com.mikepenz.fastadapter.FastAdapter.collapse(FastAdapter.java:958)
at com.mikepenz.fastadapter.FastAdapter.toggleExpandable(FastAdapter.java:926)
at com.mikepenz.fastadapter.FastAdapter$1.onClick(FastAdapter.java:355)

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