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java.lang.NullPointerException: 	at org.graylog.plugins.pipelineprocessor.ast.functions.FunctionArgs.lambda$getConstantArgs$0(FunctionArgs.java:54)	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174)	at java.util.HashMap$EntrySpliterator.forEachRemaining(HashMap.java:1683)	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)	at org.graylog.plugins.pipelineprocessor.ast.functions.FunctionArgs.getConstantArgs(FunctionArgs.java:55)	at org.graylog.plugins.pipelineprocessor.ast.functions.Function.preprocessArgs(Function.java:48)	at org.graylog.plugins.pipelineprocessor.ast.expressions.FunctionExpression.(FunctionExpression.java:40)	at org.graylog.plugins.pipelineprocessor.parser.PipelineRuleParser$RuleAstBuilder.exitFunctionCall(PipelineRuleParser.java:356)	at org.graylog.plugins.pipelineprocessor.parser.RuleLangParser$FunctionCallContext.exitRule(RuleLangParser.java:1323)	at org.antlr.v4.runtime.tree.ParseTreeWalker.exitRule(ParseTreeWalker.java:71)	at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:54)	at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52)	at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52)	at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52)	at org.graylog.plugins.pipelineprocessor.parser.PipelineRuleParser.parseRule(PipelineRuleParser.java:131)	at org.graylog.plugins.pipelineprocessor.rest.RuleResource.parse(RuleResource.java:109)	at sun.reflect.GeneratedMethodAccessor282.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)	at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:205)	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)	at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)	at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)	at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)	at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)	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.process.internal.RequestScope.runInScope(RequestScope.java:317)	at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)	at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)	at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:384)	at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:224)	at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)	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)