extreme pain in bicep when doing my close grip bench? feels like a nerve.

[athlete0185]

ok so this sucks. i went to do my close grip bench 5x5 last week...i usually keep my hands 8 inches apart (on the no grip part of a regular BB). i lowered it to a little below my chest and i get this extreme pain in my bicep. almost like a nerve is being pinched when i go down. even though the bicep isnt being worked it just doesnt like being put in that position. i havent had this problem before and ive been doing close grip bench for a few months now. all other chest exercises are fine, and all bicep exercises are fine. this is the ONLY exercise it hurts on. anyone know whats up?

thanks in advance.