Groovy-Eclipse Type Inferencing: Error visiting method run in class Script1619137698459

Katalon Studio 7.9.1
Mac OS 11.2.3

While I worked on a small project, Katalon Studio suddenly got frozen; not responding at all. All I could do was to terminate KS forcibly.

Recently I experience this freeze once or twice a day. I expecience this freeze when I give click KS display, possibly on Test Case script mode editor. I do not find the script having any fault which triggers KS to get crazy.

I attach the zip of the project, and .log

In the log, I could find a NullPointerException was raised:

!MESSAGE Groovy-Eclipse Type Inferencing: Error visiting method run in class Script1619137698459
!STACK 0
java.lang.NullPointerException
	at org.codehaus.groovy.ast.ClassHelper.getUnwrapper(ClassHelper.java:325)
        ...

KS7.9.1 freezed again.

!ENTRY org.eclipse.e4.ui.workbench 4 0 2021-05-02 12:48:25.448
!MESSAGE 
!STACK 0
java.lang.NullPointerException
	at com.kms.katalon.composer.components.transfer.EntityTransfer.javaToNative(EntityTransfer.java:41)
	at org.eclipse.swt.dnd.DragSource.pasteboard_provideDataForType(DragSource.java:740)
	at org.eclipse.swt.dnd.DragSource.dragSourceProc(DragSource.java:532)
	at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
	at org.eclipse.swt.internal.cocoa.NSPasteboard.dataForType(NSPasteboard.java:40)
	at org.eclipse.swt.dnd.DropTarget.drop(DropTarget.java:697)
	at org.eclipse.swt.dnd.DropTarget.outlineView_acceptDrop_item_childIndex(DropTarget.java:741)
	at org.eclipse.swt.dnd.DropTarget.dropTargetProc(DropTarget.java:466)
	at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
	at org.eclipse.swt.dnd.DropTarget.dndCallSuper(DropTarget.java:210)
	at org.eclipse.swt.dnd.DropTarget.performDragOperation(DropTarget.java:734)
	at org.eclipse.swt.dnd.DropTarget.dropTargetProc(DropTarget.java:451)
	at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
	at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:235)
	at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1146)
	at org.eclipse.swt.widgets.Tree.mouseDownSuper(Tree.java:2156)
	at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1138)
	at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2621)
	at org.eclipse.swt.widgets.Tree.mouseDown(Tree.java:2123)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:6012)
	at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
	at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:235)
	at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2150)
	at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2401)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:6136)
	at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
	at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:5386)
	at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5522)
	at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
	at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:117)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3786)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1158)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1047)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
	at com.kms.katalon.core.application.WorkbenchApplicationStarter.start(WorkbenchApplicationStarter.java:23)
	at com.kms.katalon.application.Application.runGUI(Application.java:191)
	at com.kms.katalon.application.Application.start(Application.java:102)
	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:401)
	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:657)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1447)