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java.lang.NullPointerException at javaslang.Tuple2.compareTo(Tuple2.java:80) at javaslang.Tuple2.compareTo(Tuple2.java:96) at javaslang.Tuple2.compareTo(Tuple2.java:28) at javaslang.collection.RedBlackTreeModule$Node.find(RedBlackTree.java:418) at javaslang.collection.TreeMap.get(TreeMap.java:420)