40In that regard, it must be recalled that the provisions of Title II of Regulation No 1408/71, one of which is Article 14(2)(a) of that regulation, and the provisions of Title II of Regulation No 883/2004, one of which is Article 13(1)(b) of that regulation, constitute uniform and comprehensive systems of conflict of law rules. Those provisions are intended not only to prevent the simultaneous application of a number of national legislative systems and the complications which might ensue, but also to ensure that persons falling within the scope of one of those regulations are not left without social security protection because there is no legislation which is applicable to them (see, to that effect, judgments of 1 February 2017, Tolley, C‑430/15, EU:C:2017:74, paragraph 58, and of 25 October 2018, Walltopia, C‑451/17, EU:C:2018:861, paragraph 41).
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