Minecraft 1.13 snapshots won't load after the launcher closes.

We do not have enough information to find the cause of this issue.

Please attach the crash report found in [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder] here.
If you cannot find a crash report, please attach the full launcher log found in [minecraft/launcher_log.txt|http://hopper.minecraft.net/help/guides/minecraft-logs/].

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This also happens to me :v

Crash Report:

---- Minecraft Crash Report ----
// Oops. 

Time: 10/19/17 4:14 PM
Description: Manually Triggered Debug Crash

java.lang.RuntimeException: Failed to check session lock, aborting
 at bfb.i(SourceFile:64)
 at bfb.<init>(SourceFile:50)
 at bey.<init>(SourceFile:21)
 at bez.a(SourceFile:84)
 at bib.a(SourceFile:2159)
 at boi.a(SourceFile:212)
 at blk.a(SourceFile:337)
 at boi.a(SourceFile:352)
 at blk.k(SourceFile:400)
 at blk.q(SourceFile:377)
 at bib.t(SourceFile:1625)
 at bib.az(SourceFile:1000)
 at bib.a(SourceFile:419)
 at net.minecraft.client.main.Main.main(SourceFile:123)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
 at bfb.i(SourceFile:64)
 at bfb.<init>(SourceFile:50)
 at bey.<init>(SourceFile:21)
 at bez.a(SourceFile:84)
 at bib.a(SourceFile:2159)
 at boi.a(SourceFile:212)
 at blk.a(SourceFile:337)
 at boi.a(SourceFile:352)
 at blk.k(SourceFile:400)
 at blk.q(SourceFile:377)

-- Affected screen --
Details:
 Screen name: blr
Stacktrace:
 at bib.t(SourceFile:1625)
 at bib.az(SourceFile:1000)
 at bib.a(SourceFile:419)
 at net.minecraft.client.main.Main.main(SourceFile:123)

-- System Details --
Details:
 Minecraft Version: 17w43b Operating System: Windows 8.1 (amd64) version 6.3
 Java Version: 1.8.0_25, Oracle Corporation
 Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
 Memory: 219528824 bytes (209 MB) / 368996352 bytes (351 MB) up to 1060372480 bytes (1011 MB)
 JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
 IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
 Launched Version: 1.12.2
 LWJGL: 2.9.4
 OpenGL: AMD Radeon HD 7600G GL version 4.2.12422 Compatibility Profile Context 13.152.1.3000, ATI Technologies Inc.
 GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

 Using VBOs: Yes
 Is Modded: Probably not. Jar signature remains and client brand is untouched.
 Type: Client (map_client.txt)
 Resource Packs: 
 Current Language: English (US)
 Profiler Position: N/A (disabled)
 CPU: 4x AMD A8-4555M APU with Radeon(tm) HD Graphics

See MC-10167 for a fix.