An Upper West Side marriage therapist charged in a wacky case of decidedly nontextbook dispute management — for allegedly slashing her hubby with knives — is off the hook.

Accused “psycho” therapist Joyce Poster-Lederman, 64, came to Manhattan Criminal Court yesterday with her spouse, fellow psychologist Selwyn Lederman, and pleaded down to a charge of minor harassment. As part of the plea deal, she must stay in therapy for at least another three months.

She also signed an order of protection that lets her continue to share her West 84th Street apartment with Lederman — who sustained minor lacerations — but bars her from “any criminal offenses.”