(a) It is narrated from Abu Mijlaz (may Allah have mercy on him) that he said: I prayed the morning prayer with Ibn Umar (may Allah be pleased with them both), and he did not recite the qunut. I said to Ibn Umar (may Allah be pleased with them both): "I have not seen you recite the qunut?" He said: "I have not heard this hadith from anyone among our companions."
(b) Imam al-Bayhaqi (may Allah have mercy on him) said: The forgetting of some Companions, or their laxity regarding some sunnahs, does not entail any defect (criticism, rejection) in the narration of those Companions (may Allah be pleased with them) who remembered it and kept it established.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3157