This is what comes up after it crashes. An unexpected issue occurred and the game has crashed.
https://gyazo.com/1b53f16f947455377781959850910e15

14:03:31 launcher Preparing to launch minecraft client for 1.12.2
14:03:43 launcher Checking installations.
14:03:43 launcher Minecraft client 1.12.2 is ready to start.
14:03:43 launcher Starting!
14:03:44 launcher Using default game log configuration client-1.12.xml (outputs XML)