Is the Whitehead product $[\iota_2, \eta] : \pi_4\mathbb{S}^2$ trivial?

Question

Let $\iota_2 : \pi_2\mathbb{S}^2$ be a generator and let $\eta : \pi_3\mathbb{S}^2$ be the Hopf map.

The Whitehead product $[\iota_2, [\iota_2, \iota_2]] : \pi_4\mathbb{S}^2$ must be trivial, because $$[\iota_2, [\iota_2, \iota_2]] = [\iota_2, 2\eta] = 2[\iota_2, \eta]$$

But what is $[\iota_2, \eta]$? Is it 0 or 1?