java.lang.AssertionError
   at org.netbeans.modules.autoupdate.ui.Unit$CompoundUpdate.setMarked(Unit.java:484)
   at org.netbeans.modules.autoupdate.ui.Unit.initState(Unit.java:95)
   at org.netbeans.modules.autoupdate.ui.Unit$Update.<init>(Unit.java:550)
   at org.netbeans.modules.autoupdate.ui.Unit$CompoundUpdate.<init>(Unit.java:432)
   at org.netbeans.modules.autoupdate.ui.Utilities.makeUpdateCategories(Utilities.java:249)
   at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler.checkUpdateElements(AutoupdateCheckScheduler.java:222)
   at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler.checkUpdateElements(AutoupdateCheckScheduler.java:205)
   at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler$5.run(AutoupdateCheckScheduler.java:188)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:435)
   at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler.scheduleRefreshProviders(AutoupdateCheckScheduler.java:136)
   at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler.access$500(AutoupdateCheckScheduler.java:94)
   at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler$6.run(AutoupdateCheckScheduler.java:453)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)