Collision Errors

Im getting this runtime error when colliding my avatar (maze3d style) with a simple cube:

Exception in thread "main" java.lang.Error: Invalid ray : (NaN, NaN, NaN)
        at com.xith3d.collider.RaySegment.<init>(RaySegment.java:74)
        at com.xith3d.collider.CollisionSystem.bounceCollision(CollisionSystem.j
ava:291)
        at com.xith3d.collider.CollisionSystem.processEllipsoidCollider(Collisio
nSystem.java:445)
        at com.xith3d.collider.CollisionSystem.processCollider(CollisionSystem.j
ava:501)
        at com.xith3d.collider.CollisionSystem.processCollider(CollisionSystem.j
ava:539)
        at com.xith3d.collider.CollisionSystem.processTime(CollisionSystem.java:
557)
        at com.xith3d.collider.CollisionSystem.newFrame(CollisionSystem.java:580
)
        at org.xith3d.agentcities3d.Agentcities3d.runMaze(Unknown Source)
        at org.xith3d.agentcities3d.Agentcities3d.init(Unknown Source)
        at org.xith3d.agentcities3d.Agentcities3d.main(Unknown Source)

I dont think that the error is in the definition of the collider node, i have done before with simple planes and dont had any problem:

Shape3D s3 = new Shape3D();
        GeometryArray ga =(GeometryArray) TestUtils.createCubeViaTriangles(0f, 6f, 0f, 12f, false,true);
        TestUtils.reverseWinding(ga);
        s3.setGeometry(ga);
        ColliderGeometry cg = new ColliderGeometry();
        cg.setModel(s3);
        BiTreeCollider bic = new BiTreeCollider();
        bic.build(cg);
        ColliderNode cnode = new ColliderNode(s3,ColliderNode.CT_GEOMETRY,ColliderNode.CT_GEOMETRY,false,bic);
        cs.addCollider(cnode);
      scene.addChild(s3);

Anyone can bring some light to the problem? Thanks :-/