– اَللَّهُمَّ إِنِّي أَسْأَلُكَ عِلْمًا نَافِعًا
Allaahumma innii as’aluka ‘ilman naafi’a. (Jabir ibn ‘Abdullah. Kanz al-‘Ummal #3787)
O Allah, I beg You for beneficial knowledge.
Obviously not all knowledge turns out to be beneficial, either because its contents lack usefulness or because we fail to derive benefit from it. This du’a is for protection against both of these possibilities. This point is further emphasized in another hadith that includes the du’a: “O Allah I seek Your protection against knowledge that does not benefit” (Du’a 54). See also du’a 21.
(Source: Khalid Baig’s commentary to du’aa #45 in the Accepted Whispers: Munajat-e-Maqbul)