Exception in NativeNeighbourhood plugin

Just keeps popping up

The data "null" is not legal for a JDOM attribute: A null is not a legal XML value.
org.jdom.IllegalDataException: The data "null" is not legal for a JDOM attribute: A null is not a legal XML value.
at org.jdom.Attribute.setValue(Attribute.java:486)
at org.jdom.Attribute.(Attribute.java:229) at org.jdom.Attribute.]]>(Attribute.java:252)
at org.jdom.Element.setAttribute(Element.java:1120)
at org.intellij.plugins.nativeNeighbourhood.Configurator.writeConfig(Configurator.java:196)
at org.intellij.plugins.nativeNeighbourhood.util.AbstractConfigurator.writeExternal(AbstractConfigurator.java:71)
at com.intellij.openapi.components.impl.ComponentManagerImpl.serializeComponent(ComponentManagerImpl.java:202)
at com.intellij.openapi.application.impl.ApplicationImpl.a(ApplicationImpl.java:211)
at com.intellij.openapi.application.impl.ApplicationImpl.saveSettings(ApplicationImpl.java:20)
at com.intellij.ide.SaveAndSyncHandler.b(SaveAndSyncHandler.java:39)
at com.intellij.ide.SaveAndSyncHandler.access$200(SaveAndSyncHandler.java:49)
at com.intellij.ide.SaveAndSyncHandler$3.onFrameDeactivated(SaveAndSyncHandler.java:2)
at com.intellij.ide.FrameStateManagerImpl.a(FrameStateManagerImpl.java:13)
at com.intellij.ide.FrameStateManagerImpl.access$100(FrameStateManagerImpl.java:24)
at com.intellij.ide.FrameStateManagerImpl$1.run(FrameStateManagerImpl.java:1)
at com.intellij.util.Alarm$1.run(Alarm.java:98)
at com.intellij.util.Alarm$MyThread$1.run(Alarm.java:241)
at com.intellij.openapi.application.impl.LaterInvocatorEx$FlushQueue.run(LaterInvocatorEx.java:14)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:130)
at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:121)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:97)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)