java.lang.NullPointerException
        at org.netbeans.modules.visual.layout.ConnectionWidgetLayout.calculateBestBottomAlignment(ConnectionWidgetLayout.java:353)
        at org.netbeans.modules.visual.layout.ConnectionWidgetLayout.getAdjustedAlignment(ConnectionWidgetLayout.java:316)
        at org.netbeans.modules.visual.layout.ConnectionWidgetLayout.layoutChildrenAt(ConnectionWidgetLayout.java:191)
        at org.netbeans.modules.visual.layout.ConnectionWidgetLayout.layout(ConnectionWidgetLayout.java:149)
        at org.netbeans.api.visual.widget.Widget.layout(Widget.java:1350)
        at org.netbeans.api.visual.widget.Widget.layout(Widget.java:1342)
        at org.netbeans.api.visual.widget.LayerWidget.layout(LayerWidget.java:86)
        at org.netbeans.api.visual.widget.Widget.layout(Widget.java:1342)
        at org.netbeans.api.visual.widget.Scene.layoutScene(Scene.java:312)
        at org.netbeans.api.visual.widget.Scene.validate(Scene.java:393)
        at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:292)
        at org.netbeans.api.visual.widget.SceneComponent.mouseDragged(SceneComponent.java:175)
        at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302)
        at java.awt.Component.processMouseMotionEvent(Component.java:6311)
        at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3285)
        at java.awt.Component.processEvent(Component.java:6032)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4630)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4574)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4255)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2475)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)