Los Angeles ? Courtney Love has been ordered to appear in court later this month to face an allegation that she violated her probation in an assault case by being under the influence of a controlled substance.

Superior Court Judge Rand S. Rubin issued a bench warrant for Love’s arrest, but agreed to hold it pending the Aug. 19 hearing. During that hearing, a date will be set for another hearing to decide whether Love, 41, violated probation.

Prosecutors said the alleged violation involved a narcotic, but didn’t identify it.

Love, the former lead singer for the band Hole and the widow of Kurt Cobain, wasn’t at Wednesday’s hearing. She pleaded no contest to a misdemeanor assault charge on Feb. 10.

Rubin also said he wanted a report from Love’s drug counselor.

“I’m certainly not happy with what’s going on,” he said.

At a red carpet event earlier this week, Love said: “I’m clean and sober for over a year and no one seems to care! They’re like, ‘Oh, her dramatic weight gain.’ So, stop making fun of me!”

In July, a judge praised the singer for making progress in a court-ordered drug treatment program. The treatment is tied to a misdemeanor count of being under the influence of a controlled substance in 2003 when police alleged she tried to break into a former boyfriend’s home.