java.lang.NullPointerException: This exception has no message.

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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)

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