How he pulls himself to stand? Mine likes to bounce n jump... if baby can stand, i think no harm letting him stand... don't restrict his movement i guess? If you think baby is straining to stand, then let baby rest awhile before continue his activity
Don't stop him ! Let him be, but always have someone around if he does so. My 2 kids started walking at 10 months, seldom crawl. They start standing holding on to a stool and slowly pushing the stool and eventually taking their steps.