Minecraft crashes before it even starts, but the log shows no errors

Here's my log, if you want to take a look at it:

16:25:29 launcher Preparing to launch minecraft client for 1.12.1
16:25:29 launcher Checking installations.
16:25:29 launcher Minecraft client 1.12.1 is ready to start.
16:25:29 launcher Starting!
16:25:29 launcher Using default game log configuration client-1.12.xml (outputs XML)
16:25:31 bib Setting user: gmarrf
16:25:33 bib LWJGL Version: 2.9.4