java.lang.ArrayIndexOutOfBoundsException: -1 < 0

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java.lang.ArrayIndexOutOfBoundsException: -1 < 0
at java.util.Vector.elementAt(Vector.java:427)
at softwareprojek.SoftTableModel.getColumnName(SoftTableModel.java:38)
at softwareprojek.ProVerw.tableChanged(ProVerw.java:117)
at javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:262)
at softwareprojek.SoftTableModel.addRow(SoftTableModel.java:74)
at softwareprojek.ProVerw.addRow(ProVerw.java:170)
at softwareprojek.MainWindow.updatePV(MainWindow.java:203)
at softwareprojek.InsertProduct.addProductToDB(InsertProduct.java:141)
at softwareprojek.InsertProduct$1.actionPerformed(InsertProduct.java:62)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)
at java.awt.Component.processMouseEvent(Component.java:3715)
at java.awt.Component.processEvent(Component.java:3544)
at java.awt.Container.processEvent(Container.java:1164)
at java.awt.Component.dispatchEventImpl(Component.java:2593)
at java.awt.Container.dispatchEventImpl(Container.java:1213)
at java.awt.Component.dispatchEvent(Component.java:2497)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2451)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2216)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2125)
at java.awt.Container.dispatchEventImpl(Container.java:1200)
at java.awt.Window.dispatchEventImpl(Window.java:914)
at java.awt.Component.dispatchEvent(Component.java:2497)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)

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