Rob Kardashian Fight With Blac Chyna Was Triggered By Cocaine

Blac Chyna didn 't get beaten up by Rob Kardashian as she claims .. . SHE was the aggressor in a cocaine - fueled rage .. . so say sources connected to the Kardashians . Chyna is suing Rob, Kris, Khloe , Kourtney , Kim, Kylie and Kendall , claiming they conspired to torpedo her reality show and also caused her great pain over an alleged domestic violence incident in April . She says Rob knocked her to the ground and hit her in a rage . Our Kardashian sources say the real story is this ... they claim the day before the incident, Chyna was using coke and drinking alcohol from morning till night . They say later that night Chyna and Rob went to a strip club and Chyna got a stripper to come home with them . We 're told Chyna partied with the stripper all night long, doing more coke and continuing her drinking binge while Rob watched Dream and King Cairo . Our sources say Rob confronted Chyna the next morning, kicking the stripper out , calling Chyna irresponsible . He claims she went ballistic , hitting him , throwing things at him and berating him . Rob insists he only defended himself and never struck her . The sources say Rob actually had an appointment that day with the L . A. County Dept. of Children and Family Services , which had an open case against Chyna. He says he protected her by not mentioning the incident. Shawn Holley, the Kardashian lawyer, tells reporters , " We have witness statements and other evidence which will demonstrate conclusively that it is Chyna - - not Rob - - who is the violent and aggressive abuser ."source claims Chyna tried shaking the family down for millions before filing suit . When Chyna's lawyer was contacted, she said , " There 's no excuse for domestic violence ." She did not comment on the allegations against her client .