java.lang.NullPointerException
   at org.netbeans.core.startup.preferences.NbPreferences.put(NbPreferences.java:179)
   at org.netbeans.core.startup.preferences.NbPreferences.put(NbPreferences.java:174)
   at org.netbeans.minify.ui.MinifyProperty.store(MinifyProperty.java:112)
   at org.netbeans.minify.ui.JSCSSMinifyCompressCustomPanel.store(JSCSSMinifyCompressCustomPanel.java:991)
   at org.netbeans.minify.ui.JSCSSMinifyCompressOptionsPanelController.applyChanges(JSCSSMinifyCompressOptionsPanelController.java:45)
   at org.netbeans.modules.options.CategoryModel$Category.applyChanges(CategoryModel.java:401)
   at org.netbeans.modules.options.CategoryModel$Category.access$1100(CategoryModel.java:326)
   at org.netbeans.modules.options.CategoryModel.save(CategoryModel.java:222)
   at org.netbeans.modules.options.OptionsPanel.save(OptionsPanel.java:319)
   at org.netbeans.modules.options.OptionsDisplayerImpl$OptionsPanelListener$3.run(OptionsDisplayerImpl.java:537)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl$3.run(RunOffEDTImpl.java:275)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)