Separate GUI Null Pointer

[DLu]

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.BufferStrategyPaintManager.flushAccumulatedRegion(BufferStrategyPaintManager.java:420)
at javax.swing.BufferStrategyPaintManager.endPaint(BufferStrategyPaintManager.java:380)
at javax.swing.RepaintManager.endPaint(RepaintManager.java:1313)
at javax.swing.JComponent._paintImmediately(JComponent.java:5164)
at javax.swing.JComponent.paintImmediately(JComponent.java:4969)
at javax.swing.RepaintManager$3.run(RepaintManager.java:808)
at javax.swing.RepaintManager$3.run(RepaintManager.java:796)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:796)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:769)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:718)
at javax.swing.RepaintManager.access$1100(RepaintManager.java:62)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1677)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Exception in thread "Thread-49" java.lang.NullPointerException
at javax.swing.BufferStrategyPaintManager$BufferInfo.(BufferStrategyPaintManager.java:693)
at javax.swing.BufferStrategyPaintManager.prepare(BufferStrategyPaintManager.java:515)
at javax.swing.BufferStrategyPaintManager.copyArea(BufferStrategyPaintManager.java:322)
at javax.swing.RepaintManager.copyArea(RepaintManager.java:1264)
at javax.swing.JViewport.blitDoubleBuffered(JViewport.java:1596)
at javax.swing.JViewport.windowBlitPaint(JViewport.java:1559)
at javax.swing.JViewport.setViewPosition(JViewport.java:1102)
at javax.swing.JViewport.scrollRectToVisible(JViewport.java:439)
at javax.swing.JComponent.scrollRectToVisible(JComponent.java:3098)
at HackGUI.Utilities.tableCenterScroll(Unknown Source)
at HackGUI.PointedMemoryComponent.setPointer(Unknown Source)
at builtInChips.RAM.reCompute(Unknown Source)
at Hack.Gates.Gate.doEval(Unknown Source)
at Hack.Gates.Gate.eval(Unknown Source)
at Hack.Gates.CompositeGate.reCompute(Unknown Source)
at Hack.Gates.Gate.doEval(Unknown Source)
at Hack.Gates.Gate.eval(Unknown Source)
at Hack.HardwareSimulator.HardwareSimulator.performEval(Unknown Source)
at Hack.HardwareSimulator.HardwareSimulator.doCommand(Unknown Source)
at Hack.Controller.HackController.miniStep(Unknown Source)
at Hack.Controller.HackController.singleStep(Unknown Source)
at Hack.Controller.HackController.access$000(Unknown Source)
at Hack.Controller.HackController$SingleStepTask.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)