Why does the powerup not draw to the screen?

Question

I've been making a breakout game recently and I've come upon a problem. So, I made a powerup function to randomly draw powerups to the screen. However when I run powerup:render, nothing happens. Where is the problem and how can I solve it?

This is the powerup:render code:

  if self.inplay then
    love.graphics.draw(gTextures['main'], gFrames['powerups'][math.random(1,9)],
        self.x, self.y)
    print('Powerup drew to the screen')
  end
end 

This is the place where I call the code:

powerup = Powerups:init(self.ball.x, self.ball.y)
    table.insert(self.powerups, powerup)
    print("Powerup inserted")
    Powerups:render()