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java.lang.NullPointerException: 	at com.google.gerrit.server.index.change.ChangeIndexRewriter.isIndexPredicate(ChangeIndexRewriter.java:235)	at com.google.gerrit.server.index.change.ChangeIndexRewriter.rewriteImpl(ChangeIndexRewriter.java:185)	at com.google.gerrit.server.index.change.ChangeIndexRewriter.rewriteImpl(ChangeIndexRewriter.java:157)	at com.google.gerrit.server.index.change.ChangeIndexRewriter.rewrite(ChangeIndexRewriter.java:141)	at com.google.gerrit.server.query.QueryProcessor.query(QueryProcessor.java:177)	at com.google.gerrit.server.query.QueryProcessor.query(QueryProcessor.java:139)	at com.google.gerrit.server.query.QueryProcessor.query(QueryProcessor.java:122)	at com.google.gerrit.server.query.InternalQuery.query(InternalQuery.java:71)	at com.google.gerrit.server.query.change.InternalChangeQuery.byProject(InternalChangeQuery.java:144)	at com.google.gerrit.server.git.SearchingChangeCacheImpl$Loader.load(SearchingChangeCacheImpl.java:137)	at com.google.gerrit.server.git.SearchingChangeCacheImpl$Loader.load(SearchingChangeCacheImpl.java:123)	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3542)	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2323)	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2286)	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201)	at com.google.common.cache.LocalCache.get(LocalCache.java:3953)	at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3957)	at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4875)	at com.google.gerrit.server.git.SearchingChangeCacheImpl.getChangeData(SearchingChangeCacheImpl.java:102)	at com.google.gerrit.server.git.VisibleRefFilter.visibleChangesBySearch(VisibleRefFilter.java:236)	at com.google.gerrit.server.git.VisibleRefFilter.visible(VisibleRefFilter.java:216)	at com.google.gerrit.server.git.VisibleRefFilter.filter(VisibleRefFilter.java:126)	at com.google.gerrit.server.git.VisibleRefFilter.filter(VisibleRefFilter.java:208)	at com.google.gerrit.server.git.VisibleRefFilter.getAdvertisedRefs(VisibleRefFilter.java:197)	at org.eclipse.jgit.transport.AbstractAdvertiseRefsHook.advertiseRefs(AbstractAdvertiseRefsHook.java:62)	at org.eclipse.jgit.transport.UploadPack.sendAdvertisedRefs(UploadPack.java:870)	at org.eclipse.jgit.transport.UploadPack.service(UploadPack.java:718)	at org.eclipse.jgit.transport.UploadPack.upload(UploadPack.java:667)	at com.google.gerrit.sshd.commands.Upload.runImpl(Upload.java:92)	at com.google.gerrit.sshd.AbstractGitCommand.service(AbstractGitCommand.java:101)	at com.google.gerrit.sshd.AbstractGitCommand.access$000(AbstractGitCommand.java:32)	at com.google.gerrit.sshd.AbstractGitCommand$1.run(AbstractGitCommand.java:70)	at com.google.gerrit.sshd.BaseCommand$TaskThunk.run(BaseCommand.java:442)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)	at com.google.gerrit.server.git.WorkQueue$Task.run(WorkQueue.java:407)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)