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java.lang.NullPointerException: null	at com.bolyuba.nexus.plugin.npm.hosted.RecreateMetadataWalkerProcessor.extractPackageJson(RecreateMetadataWalkerProcessor.java:183)	at com.bolyuba.nexus.plugin.npm.hosted.RecreateMetadataWalkerProcessor.onCollectionExit(RecreateMetadataWalkerProcessor.java:110)	at org.sonatype.nexus.proxy.walker.DefaultWalker.onCollectionExit(DefaultWalker.java:325)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:226)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:209)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:209)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walk(DefaultWalker.java:89)	at com.bolyuba.nexus.plugin.npm.hosted.DefaultNpmHostedRepository.recreateNpmMetadata(DefaultNpmHostedRepository.java:106)	at com.bolyuba.nexus.plugin.npm.task.NpmHostedMetadataRebuildTask.doExecute(NpmHostedMetadataRebuildTask.java:50)	at com.bolyuba.nexus.plugin.npm.task.NpmTaskSupport.doRun(NpmTaskSupport.java:55)	at com.bolyuba.nexus.plugin.npm.task.NpmTaskSupport.doRun(NpmTaskSupport.java:37)	at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:151)	at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:418)	at org.sonatype.nexus.threads.MDCAwareCallable.call(MDCAwareCallable.java:44)	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)	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)