Maven plugin exception under 4.0

Error message: Error during dispatching of
java.awt.event.MouseEvent[MOUSE_RELEASED,(119,535),button=3,modifiers=Meta+B
utton3,clickCount=1] on frame0
java.lang.NullPointerException

at mavenPlugin.ListPopupListener.maybePopup(ListPopupListener.java:27)

at mavenPlugin.ListPopupListener.mouseReleased(ListPopupListener.java:20)

at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:232)

at java.awt.Component.processMouseEvent(Component.java:5100)

at java.awt.Component.processEvent(Component.java:4897)

at java.awt.Container.processEvent(Container.java:1569)

at java.awt.Component.dispatchEventImpl(Component.java:3615)

at java.awt.Container.dispatchEventImpl(Container.java:1627)

at java.awt.Component.dispatchEvent(Component.java:3477)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)

at java.awt.Container.dispatchEventImpl(Container.java:1613)

at java.awt.Window.dispatchEventImpl(Window.java:1606)

at java.awt.Component.dispatchEvent(Component.java:3477)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)

at com.intellij.ide.q.b(q.java:80)

at com.intellij.ide.q.a(q.java:91)

at com.intellij.ide.q.dispatchEvent(q.java:63)

at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.ja
va:201)

at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java
:151)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)