Hand getting numb towards the end of jelquing. Help!?

Hey 2 days ago I bought Palmers Cocoa butter to jelq with. It works excellent and I feel like Im finally getting a smooth jelq correctly. However both times, in my last 20 jelqs, (I do 200) my index finger on my right hand felt a sort of pins and needles feeling. I tried using my middle finger instead and it resulted in a bigger portion of my hand feeling the same sort of numb feeling. This is the same hand that I stretch with. Could the cocoa butter be causing this, and cause I don’t want my penis to be numb. What can I do to prevent this?