The Supreme Personality of Godhead will certainly protect a devotee who does something sinful accidentally. As the Lord says in the Bhagavad-gītā (9.30-31):

api cet su-durācāro bhajate mām ananya-bhāk
sādhur eva sa mantavyaḥ saṁyag vyavasito hi saḥ

kṣipraṁ bhavati dharmātmā śaśvac-chāntiṁ nigacchati
kaunteya pratijānīhi na me bhaktaḥ praṇaśyati

“Even if one commits the most abominable actions, if he is engaged in devotional service he is to be considered saintly because he is properly situated in his determination. He quickly becomes righteous and attains lasting peace. O son of Kuntī, declare it boldly that My devotee never perishes.” However, if a devotee or so-called devotee purposefully commits sinful activities continually in the hope that Kṛṣṇa will give him protection, Kṛṣṇa will not protect him. Therefore Śrī Caitanya Mahāprabhu said, kāli ke rākhibe, yadi nā dibe rāja-dhana?: “Jagannātha has saved Gopīnātha Paṭṭanāyaka from being killed by the King today, but if he commits the same offense again, who will give him protection?” Śrī Caitanya Mahāprabhu thus warns all such foolish devotees that Jagannātha will not protect them if they continue to commit offenses.