Accidentally canceled ride

My mom and I got in an Uber. My phone was unlocked in my pocket and I must have accidentally pressed/swiped something because as soon as I took the phone out of my pocket I saw that I accidentally canceled the ride. I was very apologetic. The driver, who was very nice and polite, seemed half annoyed (understandable) and half understanding. It was a $12 ride (1 mile—mom is disabled). I tried reordering the Uber, but the app wouldn’t let me. So I gave the driver $20 cash up front before he drove us, so an $8 tip for the ride and the extra trouble I caused. Is there a better way I could have handled that for the driver other than not being a dumbass who accidentally canceled? Thanks!