My Minecraft crashes every time I press the Change Skin button and I'm not sure why , pls help

So in my Minecraft, I've had this skin I chose a few months ago but it's time for a change. I opened the app and everything was fine so I pressed the button to go to where you can change your skin to a custom one . And it gets me there and once that loads, my Minecraft crashes. It happens everytime I try to change me skin. Soo like, I need some help because I do not want to stay with the same boring skin I've had.