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

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java.lang.NullPointerException:
at br.com.jdbc.victor.dao.entidadesdao.MySQLPrioridadeDetalheDAO.getCodPrioridade(MySQLPrioridadeDetalheDAO.java:113)
at br.com.jdbc.victor.view.FormNovaChamada.cbPrioridadeDetalheActionPerformed(FormNovaChamada.java:285)
at br.com.jdbc.victor.view.FormNovaChamada.access$000(FormNovaChamada.java:26)
at br.com.jdbc.victor.view.FormNovaChamada$1.actionPerformed(FormNovaChamada.java:109)
at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1258)
at javax.swing.JComboBox.contentsChanged(JComboBox.java:1332)
at javax.swing.JComboBox.intervalRemoved(JComboBox.java:1352)
at javax.swing.AbstractListModel.fireIntervalRemoved(AbstractListModel.java:179)
at javax.swing.DefaultComboBoxModel.removeAllElements(DefaultComboBoxModel.java:174)
at javax.swing.JComboBox.removeAllItems(JComboBox.java:771)
at br.com.jdbc.victor.view.FormNovaChamada.(FormNovaChamada.java:58)
at br.com.jdbc.victor.view.FormNovaChamada.lambda$main$1(FormNovaChamada.java:482)
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)

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