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

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java.lang.AssertionError:
at com.jme3.scene.GeometryGroupNode.getGeometryStartIndex(GeometryGroupNode.java:13)
at com.jme3.scene.instancing.InstancedNode.ungroupSceneGraph(InstancedNode.java:273)
at com.jme3.scene.instancing.InstancedNode.ungroupSceneGraph(InstancedNode.java:265)
at com.jme3.scene.instancing.InstancedNode.detachChildAt(InstancedNode.java:284)
at com.jme3.scene.Node.detachChild(Node.java:385)
at com.jme3.scene.Spatial.removeFromParent(Spatial.java:976)
at tests.TestInstanceNode.simpleUpdate(TestInstanceNode.java:85)
at com.jme3.app.SimpleApplication.update(SimpleApplication.java:239)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:151)
at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:197)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:232)
at java.lang.Thread.run(Thread.java:745)

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