Java.lang.NullPointerException: This exception has no message.

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problem with using a thread to add new row in a time slice

This exception has no message.

please help - problem with using a thread to add new row in a time slice

This exception has no message.

Java.lang.NullPointerException: 	at mygui.myClientContainer.myClientDetailPanel.myClientTable$myClientTableModel.getValueAt(myClientTable.java:190)	at mygui.myClientContainer.myClientDetailPanel.myClientTable$myClientTableModel.getColumnClass(myClientTable.java:194)