Minecraft crashes as soon as it launches

I'm not ENTIRELY sure if it's a Java update I haven't gotten or something similar, but Minecraft crashes as soon as I load it. The launcher's fine, but when it gets to the "Mojang"- crash.

This is what I get when I look at the log.
1 fatal5 infos6206 debugs
20:50:38
launcher
main
info
Preparing to launch minecraft client for 19w12b
20:50:39
launcher
main
info
Checking installations.
20:50:39
launcher
main
info
Minecraft client 19w12b is ready to start.
20:50:39
launcher
main
info
Starting!
20:50:39
launcher
main
info
Using default game log configuration client-1.12.xml (outputs XML)
20:51:38
monitor
Process Monitor
fatal
Process crashed with exit code -805306369