NEW YORK, SEPT. 12 -- Bess Myerson seemed unstable and capable of harming herself physically in April after she was forced to resign as cultural affairs commissioner here because of alleged improprieties, according to Mayor Edward I. Koch.

As a result, he invited her to a Passover dinner several days later to make sure she had company, the mayor said.

"I believe there was serious question to her stability," he said. "By that I mean when this occurred, it was at Passover. And I thought to myself, she is alone. I worried about what she might do to herself."

During taping Friday of the WCBS-TV "Newsmakers" program to be broadcast Sunday morning, Koch was asked whether he had thought Myerson might commit suicide.

"Well," the mayor answered, "I worried about her stability . . . . So I thought that it was both Jewish and Christian on the first night of the Seder, to call her up and say if you're alone, I don't want you to be alone.

"After all, I've known her for 25 years," he added. "I would do that for someone I didn't know for 25 years if I thought that company was required.

"Holidays are particularly depressing when you are alone," he said after the taping.

Passover is the Jewish holiday commemorating the Israelites' exodus from Egypt and is celebrated at a ritual meal known as a Seder.

A telephone call to Myerson's suburban New York home was not answered today.

Myerson, 62, a former Miss America, resigned April 9 after a report by a former federal judge found she had improperly influenced a state judge who was conducting an alimony hearing involving her companion, contractor Carl Capasso.