The New York Post said Bynes' court date is related to her arrest for allegedly throwing a marijuana bong out of her 36th-floor apartment window.
Prosecutors have filed paperwork saying they are ready for trial, but they made no offer or recommendation for a plea deal in the case, the Post said.
Her next court date was set for Sept. 26.
The 27-year-old actress starred in "The Amanda Show," as well as the films "Hairspray" and "What a Girl Wants," but her last major screen credit was a supporting role in 2010's "Easy A."
Her once-bright career has been eclipsed in recent years by her bizarre Twitter rants and media reports of her erratic behavior and brushes with the law.