java.lang.NullPointerException
        at l1j.server.server.datatables.DropTable.isDropListItem(DropTable.java:83)
        at manager.dialog.DropEdit.step2(DropEdit.java:520)
        at manager.dialog.DropEdit.access$100(DropEdit.java:60)
        at manager.dialog.DropEdit$10.widgetSelected(DropEdit.java:325)
        at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
        at manager.dialog.DropEdit.open(DropEdit.java:126)
        at manager.dialog.DropMonsterFind$1.handleEvent(DropMonsterFind.java:115)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
        at manager.dialog.DropMonsterFind.open(DropMonsterFind.java:63)
        at manager.Manager$3.widgetSelected(Manager.java:383)
        at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
        at manager.dialog.DropEdit.open(DropEdit.java:126)
        at manager.dialog.DropMonsterFind$1.handleEvent(DropMonsterFind.java:115)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
        at manager.dialog.DropMonsterFind.open(DropMonsterFind.java:63)
        at manager.Manager$3.widgetSelected(Manager.java:383)
        at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
        at manager.Manager.open(Manager.java:413)
        at manager.Manager.open(Manager.java:417)
        at manager.Manager.getInstance(Manager.java:120)
        at manager.Manager$1.run(Manager.java:140)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$500(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)

라는 내용이 서버창에 뜨면서 수정을 시도했던 해당 몬스터의 모든 드랍테이블이 날아가버립니다...
오래전에 이 팩을 돌렸을 때 이런 문제는 없었는데 혹시 이유를 아시는 분이 계실까요