Exception in Properties Editor Plugin

Right-click on a property key in the properties file produces this exception:

Error message: Error during dispatching of java.awt.event.MouseEvent[MOUSE_RELEASED,(49,410),button=3,modifiers=Meta+Button3,clickCount=1] on frame0
java.lang.AssertionError

at com.intellij.psi.c.a.a.update(a.java:14)

at com.intellij.openapi.actionSystem.impl.e.a(e.java:67)

at com.intellij.openapi.actionSystem.impl.e.a(e.java:2)

at com.intellij.openapi.actionSystem.impl.b$b_.show(b$b_.java:19)

at com.propertiesEditor.propedit.event.MyEditorPopupHandler.invokePopup(MyEditorPopupHandler.java:39)

at com.intellij.util.EditorPopupHandler.a(EditorPopupHandler.java:3)

at com.intellij.util.EditorPopupHandler.mouseReleased(EditorPopupHandler.java:7)

at com.intellij.openapi.editor.impl.EditorImpl.c(EditorImpl.java:630)

at com.intellij.openapi.editor.impl.EditorImpl.access$6100(EditorImpl.java:126)

at com.intellij.openapi.editor.impl.EditorImpl$f_.mouseReleased(EditorImpl$f_.java:14)

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.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:80)

at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:119)

at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:152)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java: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)