getIconHeight NullPointerException

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Stack=java.lang.NullPointerException: Cannot invoke "javax.swing.Icon.getIconHeight()" because "this.defaultIcon" is null
        at java.desktop/javax.swing.JLabel.setIcon(JLabel.java:415)
        at com.timestored.qstudio.servertree.CustomNode$CustomNodeRenderer.getTreeCellRendererComponent(CustomNode.java:124)
        at java.desktop/javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(BasicTreeUI.java:3279)
        at java.desktop/javax.swing.tree.AbstractLayoutCache.getNodeDimensions(AbstractLayoutCache.java:497)
        at java.desktop/javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.updatePreferredSize(VariableHeightLayoutCache.java:1344)
        at java.desktop/javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1465)
        at java.desktop/javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1272)
        at java.desktop/javax.swing.tree.VariableHeightLayoutCache.ensurePathIsExpanded(VariableHeightLayoutCache.java:967)
        at java.desktop/javax.swing.tree.VariableHeightLayoutCache.setExpandedState(VariableHeightLayoutCache.java:181)
        at java.desktop/javax.swing.plaf.basic.BasicTreeUI.updateExpandedDescendants(BasicTreeUI.java:2059)
        at java.desktop/javax.swing.plaf.basic.BasicTreeUI$Handler.treeExpanded(BasicTreeUI.java:4351)
        at java.desktop/javax.swing.JTree.fireTreeExpanded(JTree.java:2853)
        at java.desktop/javax.swing.JTree.setExpandedState(JTree.java:3766)
        at java.desktop/javax.swing.JTree.expandPath(JTree.java:2296)
        at com.timestored.qstudio.servertree.ObjectTreePanel$2.run(ServerTreePanel.java:169)
        at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
        at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
        at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
        at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
        at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
        at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
        at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
        at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
        at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
        at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
        at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)