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java.lang.NullPointerException: 	at javax.swing.DefaultRowSorter.getViewToModelAsInts(DefaultRowSorter.java:742)	at javax.swing.DefaultRowSorter.sort(DefaultRowSorter.java:572)	at javax.swing.DefaultRowSorter.shouldOptimizeChange(DefaultRowSorter.java:1025)	at javax.swing.DefaultRowSorter.rowsInserted(DefaultRowSorter.java:867)	at javax.swing.JTable.notifySorter(JTable.java:4270)	at javax.swing.JTable.sortedTableChanged(JTable.java:4118)	at javax.swing.JTable.tableChanged(JTable.java:4395)	at javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:296)	at javax.swing.table.AbstractTableModel.fireTableRowsInserted(AbstractTableModel.java:231)	at undefined.GoodsView$GoodsViewTableModel.addPositions(Main.java:215)	at undefined.GoodsView$2.process(Main.java:113)	at javax.swing.SwingWorker$3.run(SwingWorker.java:414)	at sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:112)	at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(SwingWorker.java:832)	at sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:112)	at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(SwingWorker.java:842)	at javax.swing.Timer.fireActionPerformed(Timer.java:313)	at javax.swing.Timer$DoPostEvent.run(Timer.java:245)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)	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)