IdeaSpring plugin NPE

I occasionally see the following Exception in the Idea Exception Handler:
-

No message
java.lang.NullPointerException
at com.yanaware.intellij.ideaspring.utils.NavigatorImpl.isConfigFile(NavigatorImpl.java:436)
at
com.yanaware.intellij.ideaspring.action.GoToDeclarationAction.navigate(GoToDeclarationAction.java:71)
at
com.yanaware.intellij.ideaspring.action.GoToDeclarationAction.actionPerformed(GoToDeclarationAction.java:50)
at
com.intellij.openapi.keymap.impl.IdeMouseEventDispatcher.dispatchMouseEvent(IdeMouseEventDispatcher.java:23)
at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:40)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:162)
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)
-

It doesn't seem to effect anything, but it is annoying.