Yes, it is crucial to have a climbing helmet while rock climbing. The climbing helmets are designed to prevent you from serious head injuries in case of any accidents. As a climbing professional, you should protect your head from the falling rocks or the upside-down landings.
Additionally, you may also require a climbing helmet for climbing indoors as most gyms will demand them as per their rules and liability waivers. The brand or the type of helmet doesn’t matter. However, it is mandatory to wear them to keep your head protected all the time.