covering crack in rendered internal wall

I have a double brick house with rendered internal walls built in 1959. There is a crack in the lounge room wall that goes from the top corner of a doorway up to the ceiling. I dont think there is a huge structural problem or anything like that - it just doesnt look very attractive.

I have tried filling the crack with filler products when I have painted the room, but it just re-appears. This time I am thinking of covering the crack by covering the wall with 5mm plasterboard glued to the rendered wall behind. However, I am in two-minds about this because I am wondering whether the plaster board will just crack too.... Does anyone have any advice or suggestions ?


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