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

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java.lang.NullPointerException:
at java.util.HashMap.putMapEntries(HashMap.java:500)
at java.util.HashMap.(HashMap.java:489)
at org.graylog2.plugin.inputs.Extractor.runConverters(Extractor.java:250)
at org.graylog2.filters.ExtractorFilter.filter(ExtractorFilter.java:62)
at org.graylog2.messageprocessors.MessageFilterChainProcessor.process(MessageFilterChainProcessor.java:100)
at org.graylog2.shared.buffers.processors.ProcessBufferProcessor.dispatchMessage(ProcessBufferProcessor.java:82)
at org.graylog2.shared.buffers.processors.ProcessBufferProcessor.onEvent(ProcessBufferProcessor.java:61)
at com.lmax.disruptor.WorkProcessor.run(WorkProcessor.java:139)
at java.lang.Thread.run(Thread.java:745)

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