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A woman was hospitalized for a possible drug overdose while attending singer Chris Brown’s 30th birthday party in California. According to The Blast, the private party was in full swing at Sky High Sports, a trampoline center in Woodland Hills that was closed to the public for the private event attended by Brown’s closest pals.

Brown, who was born on Cinco de Mayo, is pictured above with his girlfriend Ammika Harris.

Law enforcement sources tell The Blast, the L.A. City Fire Department got a call at 11:56 PM for a possible overdose. One woman was transported by ambulance to a local hospital, and her medical condition is currently unknown.

LAPD also arrived at the scene of Brown’s party to search for drugs, but the partygoers had already scattered to the wind before the police arrived.

Brown was seen leaving the party in a Rolls Royce after the ambulance arrived to transport the stricken party guest to the hospital.

Celebrity guests included rappers Nelly and O.T. Genasis, however Brown’s most loyal defender, Justin Bieber, did not show up to jump around, according to The Blast.

Bieber caught flack last week for comparing Brown to Michael Jackson and Tupac Shakur, both considered g.o.a.t. [greatest of all time] in their genre of music.

Photo by Best Image / BACKGRID