Model Update with no selected searchnetwork throws NullPointerException

Cytoscape 3.4.0> Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at org.cytoscape.application.internal.CyApplicationManagerImpl.internalSetCurrentNetwork(CyApplicationManagerImpl.java:159)
        at org.cytoscape.application.internal.CyApplicationManagerImpl.setCurrentNetwork(CyApplicationManagerImpl.java:150)
        at be.ugent.psb.thpar.jesse_cytoscape.gui.TabPane.actionPerformed(TabPane.java:237)
        at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1258)
        at javax.swing.JComboBox.contentsChanged(JComboBox.java:1332)
        at javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:118)
        at be.ugent.psb.thpar.jesse_cytoscape.gui.NetworkSelectionModel.refresh(NetworkSelectionModel.java:70)
        at be.ugent.psb.thpar.jesse_cytoscape.gui.TabPane.update(TabPane.java:281)
        at java.util.Observable.notifyObservers(Observable.java:159)
        at java.util.Observable.notifyObservers(Observable.java:115)
        at be.ugent.psb.thpar.jesse_cytoscape.Model.setOrder(Model.java:100)