150In that regard, it should be noted that, according to settled case-law, the concept of ‘objective grounds’, within the meaning of clause 4(1) of the Framework Agreement, must be understood as not permitting a difference in treatment between fixed-term workers and permanent workers to be justified on the basis that the different treatment is provided for by a general or abstract measure, such as a law or a collective agreement (see, to that effect, judgment of 5 June 2018, Montero Mateos, C‑677/16, EU:C:2018:393, paragraph 56 and the case-law cited).
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