KDT

Crash Report below:

Preparing to launch minecraft client for 1.12.2
23:41:00 launcher main info Checking installations.
23:41:00 launcher main info Minecraft client 1.12.2 is ready to start.
23:41:00 launcher main info Starting!
23:41:01 launcher main info Using default game log configuration client-1.12.xml (outputs XML)
23:41:09 bib Client thread info Setting user: Kaiffe123
23:41:18 bid Client thread warn Skipping bad option: lastServer:
23:41:18 bib Client thread info LWJGL Version: 2.9.4
23:41:20 cev Client thread info Reloading ResourceManager: Default
23:41:24 chm Sound Library Loader info Starting up SoundSystem...
23:41:24 chm Thread-3 info Initializing LWJGL OpenAL
23:41:24 chm Thread-3 info (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
00:41:25 game error AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
<log4j:Event logger="chm" timestamp="1508884885419" level="INFO" thread="Thread-3">
<log4j:Message><![CDATA[OpenAL initialized.]]></log4j:Message>
</log4j:Event>
00:41:25 monitor Process Monitor error expected <
23:41:25 chm Sound Library Loader info Sound engine started
23:41:48 cdp Client thread info Created: 1024x512 textures-atlas
23:41:56 com.mojang.text2speech.NarratorWindows Client thread info Narrator library for x64 successfully loaded
23:42:03 chd Server thread info Starting integrated minecraft server version 1.12.2
23:42:03 chd Server thread info Generating keypair
23:42:04 j Server thread info Loaded 488 advancements
23:42:04 net.minecraft.server.MinecraftServer Server thread info Preparing start region for level 0
23:42:05 net.minecraft.server.MinecraftServer Server thread info Preparing spawn area: 31%
23:42:05 oo Server thread warn Keeping entity minecraft:minecart that already exists with UUID 6884c576-ad9a-4f3b-a2b4-a3a66b1d6d85
23:42:07 chd Server thread info Changing view distance to 5, from 10
23:42:12 net.minecraft.server.MinecraftServer Server thread warn Can't keep up! Did the system time change, or is the server overloaded? Running 2601ms behind, skipping 52 tick(s)
23:42:17 pl Server thread info Kaiffe123[local:E:6787bfa7] logged in with entity id 349 at (1660.4926694682804, 4.0, 1331.3718798328796)
23:42:17 net.minecraft.server.MinecraftServer Server thread info Kaiffe123 joined the game
23:42:21 chd Server thread info Saving and pausing game...
23:42:22 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/overworld
23:42:23 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_nether
23:42:23 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_end
23:42:24 j Client thread info Loaded 124 advancements
23:42:29 net.minecraft.server.MinecraftServer Server thread warn Can't keep up! Did the system time change, or is the server overloaded? Running 2831ms behind, skipping 56 tick(s)
23:42:29 chd Server thread info Saving and pausing game...
23:42:32 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/overworld
23:42:32 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_nether
23:42:32 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_end
23:43:05 chd Server thread info Saving and pausing game...
23:43:05 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/overworld
23:43:05 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_nether
23:43:05 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_end
23:43:50 chd Server thread info Saving and pausing game...
23:43:50 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/overworld
23:43:50 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_nether
23:43:50 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_end
23:44:22 net.minecraft.server.MinecraftServer Server thread info Stopping server
23:44:22 net.minecraft.server.MinecraftServer Server thread info Saving players
23:44:22 pa Server thread info Kaiffe123 lost connection: Server closed
23:44:22 net.minecraft.server.MinecraftServer Server thread info Kaiffe123 left the game
23:44:22 pa Server thread info Stopping singleplayer server as player logged out
23:44:22 net.minecraft.server.MinecraftServer Server thread info Saving worlds
23:44:22 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/overworld
23:44:22 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_nether
23:44:22 net.minecraft.server.MinecraftServer Server thread info Saving chunks for level 'Kaiffe's Worksite III'/the_end
23:44:23 bib Client thread fatal Reported exception thrown!
f: Manually triggered debug crash
at bib.aD(SourceFile:1745)
at bib.t(SourceFile:1665)
at bib.az(SourceFile:1000)
at bib.a(SourceFile:419)
at net.minecraft.client.main.Main.main(SourceFile:123)
Caused by: java.lang.Throwable
... 5 more

If this does not help, sorry.

Confirmed for 1.12.2, please fix this is getting really annoying now.

Sincerely,
Kaiffe123

Thank you,

My mistake. This doesn't happen in vanilla Minecraft.

For Optifine users, be careful out there and I have emailed them

Thanks again...

Confirmed for 1.12 full release

I am extremely sorry. I did search, but I was in a bit of a rush and did not enter the correct keywords.

I will search more next time I sincerely promise