Error when refreshing plugin's list

java.util.ConcurrentModificationException at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1493) at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1516) at org.netbeans.modules.autoupdate.services.FeatureUpdateElementImpl$Agent.processContainedModules(FeatureUpdateElementImpl.java:489) at org.netbeans.modules.autoupdate.services.FeatureUpdateElementImpl$Agent.initializeAgent(FeatureUpdateElementImpl.java:414) at org.netbeans.modules.autoupdate.services.FeatureUpdateElementImpl$Agent.getContainedModuleElements(FeatureUpdateElementImpl.java:392) at org.netbeans.modules.autoupdate.services.FeatureUpdateUnitImpl.initializeFeature(FeatureUpdateUnitImpl.java:107) at org.netbeans.modules.autoupdate.services.FeatureUpdateUnitImpl.getInstalled(FeatureUpdateUnitImpl.java:52) at org.netbeans.api.autoupdate.UpdateUnit.getInstalled(UpdateUnit.java:59) at org.netbeans.modules.autoupdate.services.UpdateManagerImpl$Cache.createMaps(UpdateManagerImpl.java:329) at org.netbeans.modules.autoupdate.services.UpdateManagerImpl$Cache.getAvailableEagers(UpdateManagerImpl.java:280) at org.netbeans.modules.autoupdate.services.UpdateManagerImpl.getAvailableEagers(UpdateManagerImpl.java:104) at org.netbeans.modules.autoupdate.services.OperationContainerImpl.listAllWithPossibleEager(OperationContainerImpl.java:214) at org.netbeans.api.autoupdate.OperationContainer.listAll(OperationContainer.java:322) at org.netbeans.modules.autoupdate.ui.UpdateTableModel.getDownloadSize(UpdateTableModel.java:194) at org.netbeans.modules.autoupdate.ui.UnitTab$8.run(UnitTab.java:359) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to at org.openide.util.RequestProcessor.post(RequestProcessor.java:406) at org.netbeans.modules.autoupdate.ui.UnitTab.refreshState(UnitTab.java:356) at org.netbeans.modules.autoupdate.ui.UnitTab$10.tableChanged(UnitTab.java:506) at java.desktop/javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:297) at java.desktop/javax.swing.table.AbstractTableModel.fireTableDataChanged(AbstractTableModel.java:199) at org.netbeans.modules.autoupdate.ui.UnitCategoryTableModel.setData(UnitCategoryTableModel.java:208) at org.netbeans.modules.autoupdate.ui.UnitCategoryTableModel.setData(UnitCategoryTableModel.java:226) at org.netbeans.modules.autoupdate.ui.UpdateTableModel.setUnits(UpdateTableModel.java:56) at org.netbeans.modules.autoupdate.ui.PluginManagerUI.refreshUnitsInBackground(PluginManagerUI.java:577) at org.netbeans.modules.autoupdate.ui.PluginManagerUI.updateUnitsChanged(PluginManagerUI.java:656) at org.netbeans.modules.autoupdate.ui.UnitTab$3.updateUnitsChanged(UnitTab.java:168) at org.netbeans.modules.autoupdate.ui.UnitCategoryTableModel.fireUpdataUnitChange(UnitCategoryTableModel.java:261) at org.netbeans.modules.autoupdate.ui.UnitTab.fireUpdataUnitChange(UnitTab.java:619) at org.netbeans.modules.autoupdate.ui.UnitTab$14$1.run(UnitTab.java:790) at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [catch] at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)