ERROR: tuplestore_gettuple: invalid state

Any idea what

ERROR: tuplestore_gettuple: invalid state

could mean ?

I took the tablefunc from 7.3.3 and installed it on a 7.3.2 system.

SELECT * FROM connectby('nav', 'id_nav', 'id2_nav', 'pos', '1', 0) as
tree (id_nav int, id2_nav int, level int, serial int) join nav using
(id_nav) order by tree.serial;

TIA
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