Producer Artem "Arty" Stoliarov sued Marshmello and Bastille for plagiarism in May 2019 claiming "Happier" "deliberately copied" his 2014 remix
of the OneRepublic song "I Lived
US District Judge Philip S. Gutierrez rejected the lawsuit. He ruled on April 8, 2021 that Arty had given up ownership of the remix composition in his contract, so he had no grounds to sue.
The US Court of Appeals for the Ninth Circuit upheld the decision on March 18, 2022. The Ninth Circuit ruled when Arty signed a deal with Interscope that stated he would own no copyright to the remix, he signed away any rights to his song.