Paralyzed condition vs Critical hit

@JeremyECrawford if paralyzed target is hit with a non-attack roll spell (e.g. fireball), & attacker is within 5 feet, is it a critical hit?

— Erik Strong (@ErikStrong) August 14, 2015

The spellcaster isn't hitting the paralyzed target with an attack, so it's not a critical hit. https://t.co/wHXJuL7CgP

— Jeremy Crawford (@JeremyECrawford) August 14, 2015