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

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at com.jme3.scene.GeometryGroupNode.getGeometryStartIndex(
at com.jme3.scene.instancing.InstancedNode.ungroupSceneGraph(
at com.jme3.scene.instancing.InstancedNode.ungroupSceneGraph(
at com.jme3.scene.instancing.InstancedNode.detachChildAt(
at com.jme3.scene.Node.detachChild(
at com.jme3.scene.Spatial.removeFromParent(
at tests.TestInstanceNode.simpleUpdate(
at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(
at com.jme3.system.lwjgl.LwjglDisplay.runLoop(

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