32Thus, an action concerns matters relating to a contract within the meaning of point 1(a) of Article 7 of Regulation No 1215/2012 if the interpretation of the contract between the defendant and the applicant appears indispensable to establish the lawful or, on the contrary, unlawful nature of the conduct complained of against the former by the latter (see, to that effect, judgment of 13 March 2014, Brogsitter, C‑548/12, EU:C:2014:148, paragraph 25). That is in particular the case of an action based on the terms of a contract or on rules of law which are applicable by reason of that contract (see, to that effect, judgments of 10 September 2015, Holterman Ferho Exploitatie and Others, C‑47/14, EU:C:2015:574, paragraph 53, and of 15 June 2017, Kareda, C‑249/16, EU:C:2017:472, paragraphs 30 to 33).
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