java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at jetbrains.mps.nodeEditor.cellActions.CellAction_DeleteNode.getSiblingToSelect(CellAction_DeleteNode.java:82)
at jetbrains.mps.nodeEditor.cellActions.CellAction_DeleteNode.execute(CellAction_DeleteNode.java:65)
at jetbrains.mps.nodeEditor.actions.ActionHandlerImpl$1.doExecute(ActionHandlerImpl.java:56)
at jetbrains.mps.editor.runtime.commands.EditorCommand.run(EditorCommand.java:52)
at jetbrains.mps.smodel.WorkbenchModelAccess$CommandRunnable$1.run(WorkbenchModelAccess.java:642)
at jetbrains.mps.smodel.WriteActionDispatcher.run(WriteActionDispatcher.java:39)
at jetbrains.mps.smodel.WorkbenchModelAccess$3.run(WorkbenchModelAccess.java:135)
at jetbrains.mps.smodel.WorkbenchModelAccess.runWriteAction(WorkbenchModelAccess.java:144)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:124)
at jetbrains.mps.smodel.WorkbenchModelAccess.runWriteActionInCommand(WorkbenchModelAccess.java:450)
at jetbrains.mps.smodel.WorkbenchModelAccess.executeCommand(WorkbenchModelAccess.java:413)
at jetbrains.mps.project.ProjectModelAccess.executeCommand(ProjectModelAccess.java:43)
at jetbrains.mps.nodeEditor.actions.ActionHandlerImpl.executeAction(ActionHandlerImpl.java:53)
at jetbrains.mps.nodeEditor.actions.ActionHandlerImpl.executeAction(ActionHandlerImpl.java:43)
at jetbrains.mps.nodeEditor.selection.EditorCellSelection.executeAction(EditorCellSelection.java:166)
at jetbrains.mps.nodeEditor.selection.EditorCellLabelSelection.performDeleteAction(EditorCellLabelSelection.java:200)
at jetbrains.mps.nodeEditor.selection.EditorCellLabelSelection.executeAction(EditorCellLabelSelection.java:165)
at jetbrains.mps.ide.editor.actions.Backspace_Action.doExecute(Backspace_Action.java:55)
at jetbrains.mps.workbench.action.BaseAction$2.run(BaseAction.java:145)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher$3.performAction(IdeKeyEventDispatcher.java:595)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.processAction(IdeKeyEventDispatcher.java:646)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.inInitState(IdeKeyEventDispatcher.java:485)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.dispatchKeyEvent(IdeKeyEventDispatcher.java:215)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:622)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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