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java.lang.NullPointerException: 	at java.util.HashMap.merge(HashMap.java:1224)	at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320)	at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)	at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)	at Test.main(Test.java:11)