How can I prevent Minecraft from crashing when I get close to a specific area while holding a map?

I'm running Minecraft on an old Macbook running Snow Leopard. Ever since maps were included in the game, there's one specific area in a world of mine that I cannot approach while holding the map, or else the game will crash. I am aware that having any of the Void showing would cause a crash like this, but the section of Void that I was playing with was never visible from the upper layer of the map. Plus, I've filled it in, first with Glowstone, then with Bedrock when that didn't help. Still nothing.