Caitanya-bhagavata (Antya-lila, Chapter Eight) gives the following description. One day Srila Advaita Acarya, having extended an invitation to Caitanya Mahaprabhu, thought that if the Lord came alone He would feed Him to His great satisfaction. It then so happened that when the other sannyasis were going to Advaita Acarya's to take lunch, there was a big rainstorm, and they could not reach His house. Thus, according to Advaita Acarya's desires, Sri Caitanya Mahaprabhu came alone and accepted the prasada.