NPE During Organize Imports whilst editing a script

java.lang.NullPointerException
at org.codehaus.groovy.eclipse.refactoring.actions.OrganizeGroovyImports$FindUnresolvedReferencesVisitor.visitClosureExpression(OrganizeGroovyImports.java:177)
at org.codehaus.groovy.ast.expr.ClosureExpression.visit(ClosureExpression.java:46)
at org.codehaus.groovy.ast.CodeVisitorSupport.visitBinaryExpression(CodeVisitorSupport.java:144)
at org.codehaus.groovy.ast.expr.BinaryExpression.visit(BinaryExpression.java:49)
at org.codehaus.groovy.ast.CodeVisitorSupport.visitExpressionStatement(CodeVisitorSupport.java:69)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitExpressionStatement(ClassCodeVisitorSupport.java:209)
at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:40)
at org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:35)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:179)
at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:51)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:102)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:113)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:124)
at org.codehaus.groovy.eclipse.refactoring.actions.OrganizeGroovyImports$FindUnresolvedReferencesVisitor.visitMethod(OrganizeGroovyImports.java:160)
at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1097)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:51)
at org.codehaus.groovy.eclipse.refactoring.actions.OrganizeGroovyImports$FindUnresolvedReferencesVisitor.visitClass(OrganizeGroovyImports.java:172)
at org.codehaus.groovy.eclipse.refactoring.actions.OrganizeGroovyImports.calculateMissingImports(OrganizeGroovyImports.java:314)
at org.codehaus.groovy.eclipse.refactoring.actions.OrganizeGroovyImports.calculateAndApplyMissingImports(OrganizeGroovyImports.java:405)
at org.codehaus.groovy.eclipse.refactoring.actions.OrganizeGroovyImportsAction.run(OrganizeGroovyImportsAction.java:82)
at org.eclipse.jdt.ui.actions.OrganizeImportsAction.run(OrganizeImportsAction.java:201)
at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:278)
at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:185)
at org.eclipse.ui.internal.handlers.LegacyHandlerWrapper.execute(LegacyHandlerWrapper.java:109)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:468)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:786)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:885)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:567)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:508)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:123)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1031)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3775)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1367)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1390)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1404)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1400)
at org.eclipse.swt.widgets.Canvas.sendKeyEvent(Canvas.java:416)
at org.eclipse.swt.widgets.Control.doCommandBySelector(Control.java:958)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5068)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
at org.eclipse.swt.internal.cocoa.NSResponder.interpretKeyEvents(NSResponder.java:56)
at org.eclipse.swt.widgets.Composite.keyDown(Composite.java:587)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4978)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:220)
at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:1943)
at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2025)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5040)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:4582)
at org.eclipse.swt.widgets.Display.applicationProc(Display.java:4659)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:115)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3274)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
at org.eclipse.equinox.launcher.Main.run(Main.java:1407)