NullPointerException when deleting nodes from the graph

[Paul-Antoine Bittner]

After importing a graph (codeminer.gexf), if you select all the nodes and try to delete them, the following Exception is thrown:

java.lang.NullPointerException
 at org.gephi.graph.dhns.utils.avl.AbstractEdgeTree.remove(AbstractEdgeTree.java:239)
 at org.gephi.graph.dhns.core.GraphStructure.removeFromDictionnary(GraphStructure.java:165)
 at org.gephi.graph.dhns.core.StructureModifier$Business.deleteNode(StructureModifier.java:384)
 at org.gephi.graph.dhns.core.StructureModifier$Business.access$400(StructureModifier.java:277)
 at org.gephi.graph.dhns.core.StructureModifier.deleteNode(StructureModifier.java:103)
 at org.gephi.graph.dhns.graph.HierarchicalGraphImpl.removeNode(HierarchicalGraphImpl.java:202)
 at org.gephi.visualization.bridge.DHNSEventBridge.delete(DHNSEventBridge.java:380)
 at org.gephi.visualization.apiimpl.GraphContextMenu$7.actionPerformed(GraphContextMenu.java:116)
 at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
 at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
 at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
 at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
 at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
 at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1223)
 at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1264)
 at java.awt.Component.processMouseEvent(Component.java:6263)
 at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
 at java.awt.Component.processEvent(Component.java:6028)
 at java.awt.Container.processEvent(Container.java:2041)
 at java.awt.Component.dispatchEventImpl(Component.java:4630)
 at java.awt.Container.dispatchEventImpl(Container.java:2099)
 at java.awt.Component.dispatchEvent(Component.java:4460)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
 at java.awt.Container.dispatchEventImpl(Container.java:2085)
 at java.awt.Component.dispatchEvent(Component.java:4460)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
 at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

[Paul-Antoine Bittner (pbittner-deactivatedaccount)]

An Exception that has the same origin (AbstractEdgeTree) is also thrown when you try to use a filter on that graph (codeminer.gexf):

java.lang.NullPointerException
 at org.gephi.graph.dhns.utils.avl.AbstractEdgeTree.remove(AbstractEdgeTree.java:239)
 at org.gephi.graph.dhns.core.GraphStructure.removeFromDictionnary(GraphStructure.java:165)
 at org.gephi.graph.dhns.core.StructureModifier$Business.deleteNode(StructureModifier.java:384)
 at org.gephi.graph.dhns.core.StructureModifier$Business.access$400(StructureModifier.java:277)
 at org.gephi.graph.dhns.core.StructureModifier.deleteNode(StructureModifier.java:103)
 at org.gephi.graph.dhns.graph.HierarchicalGraphImpl.removeNode(HierarchicalGraphImpl.java:202)
 at org.gephi.filters.FilterProcessor.processNodeFilter(FilterProcessor.java:119)
 at org.gephi.filters.FilterProcessor.process(FilterProcessor.java:84)
 at org.gephi.filters.FilterThread.filter(FilterThread.java:128)
[catch] at org.gephi.filters.FilterThread.run(FilterThread.java:99)