Well if we are being stoned to death, see a vision of Jesus next to God, and feel moved to speak directly to Jesus then I don’t suppose there would be anything wrong with that at all. On the other hand, in terms of prayers at meetings, and private prayers, it seems reasonable to follow Jesus’ instruction to pray to God in Jesus’ name as was the practice of the first Christians.
The practice of praying direct to Christ in the Liturgy, as distinct from praying to God through Christ, appears to have originated among the innovating 'orthodox' opponents of Arianism in the fourth century. It slowly spread, against a good deal of opposition, eventually to produce Christocentric piety and theology.
Don Cupitt ‘The Christ of Christendom’ in The Myth of God Incarnate (1977), John Hick Ed., page 142.