java.lang.NullPointerException
	at org.eclipse.gef.dnd.TemplateTransferDropTargetListener.updateTargetRequest(TemplateTransferDropTargetListener.java:138)
	at org.eclipse.sirius.diagram.ui.tools.internal.editor.SiriusPaletteToolDropTargetListener.updateTargetRequest(SiriusPaletteToolDropTargetListener.java:110)
	at org.eclipse.gef.dnd.AbstractTransferDropTargetListener.isEnabled(AbstractTransferDropTargetListener.java:396)
	at org.eclipse.jface.util.DelegatingDropAdapter.updateCurrentListener(DelegatingDropAdapter.java:385)
	at org.eclipse.jface.util.DelegatingDropAdapter.dragOver(DelegatingDropAdapter.java:195)
	at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:84)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4131)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1056)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1080)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1065)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:779)
	at org.eclipse.swt.dnd.DropTarget.DragOver(DropTarget.java:375)
	at org.eclipse.swt.dnd.DropTarget.DragOver_64(DropTarget.java:347)
	at org.eclipse.swt.dnd.DropTarget$1.method4(DropTarget.java:255)
	at org.eclipse.swt.internal.ole.win32.COMObject.callback4(COMObject.java:104)
	at org.eclipse.swt.internal.ole.win32.COM.DoDragDrop(Native Method)
	at org.eclipse.swt.dnd.DragSource.drag(DragSource.java:370)
	at org.eclipse.swt.dnd.DragSource.lambda$0(DragSource.java:175)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4131)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1056)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3944)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3547)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1173)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1062)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:635)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:559)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:155)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:660)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:597)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1468)