The paper deals with the issue of debts incurred by minors due to using public transport without a valid ticket. The authors subsequently analyse the particular legally significant facts, namely the conclusion of the contract, the ticket inspection, the imposition of the surcharge on top of the fare, the possibility of voluntary payment of the debt, and if not paid, its further increase related to filing a claim in court. Attention is also paid to the procedural aspects of these cases, where the authors point out the unsatisfactory representation of the minor in the proceedings, which in the end appears to be the main cause of the issue. The authors also draw attention to recent changes in the fare system for people aged under 26, which may also – albeit to a limited extent – contribute to reducing the frequency of this problem.