DJ Mustard has been having a stellar year. This summer, he had a handful of hits in heavy rotation on radio stations from California to New York, from YG’s ‘My N----' to Tinashe’s ‘2 On.’ However, a few other chart-topping songs he created beats for are bringing the producer some serious drama.

According to Mike Free, Mustard’s childhood friend and former business associate, he assisted the DJ in creating Tyga’s 2011 smash ‘Rack City,’ but was given no credit. Free claims he's being snubbed by the Roc Nation artist and now he wants his royalties, TMZ reports.

In a new lawsuit filed against Mustard, Free claims he actually wrote, composed and recorded the music that ended up becoming ‘Rack City.' Free also notes he and Mustard made a childhood pact to share all composer and production credits because he had the ideas for tracks and Mustard had the means to sell them.

'Rack City' isn't the only track Free allegedly got stiffed on. He says he wasn't given credit for his work on a host of other songs including 2 Chainz’s ‘I'm Different,’ Jeremih's ‘Don't Tell 'Em,' Jamie Foxx’s Party Ain't a Party’ and most recently Big Sean’s ‘I Don't F--- With You.’

See 20 Rappers' Real Names Revealed