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

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java.lang.NullPointerException:
at org.graylog.plugins.auditlog.AuditLogger.log(AuditLogger.java:69)
at org.graylog.plugins.auditlog.AuditLogger.failure(AuditLogger.java:61)
at org.graylog.plugins.auditlog.jersey.AuditLogFilter.lambda$filter$4(AuditLogFilter.java:145)
at java.util.Optional.ifPresent(Optional.java:159)
at org.graylog.plugins.auditlog.jersey.AuditLogFilter.filter(AuditLogFilter.java:105)
at org.glassfish.jersey.server.ContainerFilteringStage$ResponseFilterStage.apply(ContainerFilteringStage.java:196)
at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:442)
at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:490)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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