Judgment_paragraph 105 · Industrias Químicas del Vallés, SA v European Commission (C-244/16 P)

105In that regard, it must be borne in mind that where a national court or tribunal considers that one or more arguments for invalidity of a European Union act, put forward by the parties or, as the case may be, raised by it of its own motion, are well founded, it is incumbent upon it to stay proceedings and to make a reference to the Court for a preliminary ruling on the act’s validity, the Court alone having jurisdiction to declare a European Union act invalid (judgment of 28 April 2015, T & L Sugars and Sidul Açúcares v Commission, C‑456/13 P, EU:C:2015:284, paragraph 48 and the case-law cited).