Is an oath binding if one conditions refraining from an act upon the will of another person?

Primary text

If a person swears, "By Allah, I will not drink, unless Zayd wills it," he prohibits himself from drinking unless Zayd's will occurs. If Zayd wills it, he may drink; if not, he must not drink. If Zayd's will is hidden due to absence, death, or insanity, he must not drink, and if he drinks, he violates his oath because he prohibited himself unless the will occurred, making drinking before its occurrence impermissible.