java.lang.NullPointerException
   at org.netbeans.modules.debugger.ui.views.debugging.FiltersDescriptor$FilterImpl.setState(FiltersDescriptor.java:455)
   at org.netbeans.modules.debugger.ui.views.debugging.FiltersDescriptor$FilterImpl.access$500(FiltersDescriptor.java:295)
   at org.netbeans.modules.debugger.ui.views.debugging.FiltersDescriptor$FilterImpl$1.preferenceChange(FiltersDescriptor.java:511)
   at sun.reflect.GeneratedMethodAccessor135.invoke(GeneratedMethodAccessor135.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:497)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:487)
   at com.sun.proxy.$Proxy11.preferenceChange(.java:0)
   at java.util.prefs.AbstractPreferences$EventDispatchThread.run(AbstractPreferences.java:1496)