According to the Ahlul-Bayt’s school of thought, Imam Zaman holds the high rank of infallibility (‘ismah) and is an infallible (ma’sum). The ma’sum is one who through Allah's (swt) grace is free from all impurity, sin, forgetfulness and error.

For further information, you can refer to:

The Concept of Infallibility and its Possibility in Individuals, 5351 (website: 5572).

The Meaning of Infallibility, 1737 (website: 1733).

Abandoning the Priority by an Infallible, Question 7880 (website: 7960).