157However, according to the case-law, even where there has been infringement of the rights of the defence, it is also necessary, for the plea to be successful, that had it not been for that irregularity, the outcome would have been different (see order of 14 April 2016, Dalli v Commission, C‑394/15 P, not published, EU:C:2016:262, paragraph 41; judgment of 6 February 2007, Wunenburger v Commission, T‑246/04 and T‑71/05, EU:T:2007:34, paragraph 149; see also judgment of 18 September 2015, Wahlström v Frontex, T‑653/13 P, EU:T:2015:652, paragraph 21 and the case-law cited).