Krishna was called one of incarnation of Lord Vishnu by Hindus. He born in Brindaban and Died in Dwarka. People engaged in worship of Krishna. His idol was made and was worshiped and people treated him as god. Guru Nanak Sahib preached people that Krishna was just Avtar of Vishnu but not god. OIne should devout in God's name only rather then worship or walking acdc. to krishna's way.