Exception on opening project file

Stack trace:

java.lang.NullPointerException
 at org.gephi.graph.dhns.core.Dhns.getIdGen(Dhns.java:123)
 at org.gephi.graph.dhns.core.EdgeProcessor.<init>(EdgeProcessor.java:52)
 at org.gephi.graph.dhns.core.StructureModifier.<init>(StructureModifier.java:57)
 at org.gephi.graph.dhns.core.GraphViewImpl.<init>(GraphViewImpl.java:36)
 at org.gephi.graph.dhns.core.GraphStructure.<init>(GraphStructure.java:70)
 at org.gephi.graph.dhns.core.Dhns.<init>(Dhns.java:85)
 at org.gephi.graph.dhns.DhnsPersistenceProvider.readXML(DhnsPersistenceProvider.java:48)
 at org.gephi.project.io.GephiReader.readWorkspaceChildren(GephiReader.java:145)
 at org.gephi.project.io.GephiReader.readWorkspace(GephiReader.java:131)
 at org.gephi.project.io.GephiReader.readProject(GephiReader.java:104)
 at org.gephi.project.io.GephiReader.readAll(GephiReader.java:81)
 at org.gephi.project.io.LoadTask.run(LoadTask.java:81)
 at org.gephi.desktop.project.ProjectControllerUIImpl$5.run(ProjectControllerUIImpl.java:281)
 at org.gephi.utils.longtask.api.LongTaskExecutor$RunningLongTask.run(LongTaskExecutor.java:228)
 at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
 at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
 at java.util.concurrent.FutureTask.run(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)