dont do 1.12.2 you wont be able to do single player it will thank it a server and kick you for some odd reason

Since Minecraft 1.3, single-player works by acting as a server (without sending data over the network, but still passing packets between two parts of the game).

Please post the exact error message. If it's a dirt screen, please post a screenshot; if it's a game crash, please attach the crash report. Also, please attach [.minecraft|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder]/logs/latest.log.

Working off of latest.log (the other log you posted is for modded 1.12.1 so it's not relevant):

You have a malformed advancement:

[18:31:01] [Server thread/ERROR]: Couldn't load loot table minecraft:entities/evocation_illager from C:\Users\Mauri\AppData\Roaming\.minecraft\saves\Darkspyro911\data\loot_tables\minecraft\entities\evocation_illager.json
com.google.gson.JsonSyntaxException:
Expected name to be an item, was unknown string 'minecraft:totem'

The ID for the totem of undying changed from minecraft:totem to minecraft:totem_of_undying in 1.11.1. You'll want to update your loot table for this.

But that shouldn't cause this problem, since 1) I can see that was a problem before and 2) that shouldn't cause a crash - just that table to be ignored.

I also see this:

[18:36:01] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
    at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
    at h.a(SourceFile:47) [1.12.2.jar:?]
    at bib.az(SourceFile:991) [1.12.2.jar:?]
    at bib.a(SourceFile:419) [1.12.2.jar:?]
    at net.minecraft.client.main.Main.main(SourceFile:123) [1.12.2.jar:?]
Caused by: java.lang.NullPointerException
    at brz.a(SourceFile:812) ~[1.12.2.jar:?]
    at kn.a(SourceFile:32) ~[1.12.2.jar:?]
    at kn.a(SourceFile:9) ~[1.12.2.jar:?]
    at hv$1.run(SourceFile:13) ~[1.12.2.jar:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
    at h.a(SourceFile:46) ~[1.12.2.jar:?]
    ... 3 more

which is repeated with slight variation many times.

brz is NetHandlerPlayClient. The line in question that seems to be erroring is requesting a field from the minecraft instance for it (in different places, but more or less the same area) - indicating NetHandlerPlayClient's instance of minecraft is null. That shouldn't happen, but I'll check if it can.

I don't have any advice yet, will need to look further. But thanks for the logs; I should be able to figure this out with them.

well it's not modded it's a function pack world

I understand (the older log had optifine+mcpatcher but this one doesn't).

Does this happen every time you run the game? Or just this once?

an outdated graphics card that's all I know of

Is this still an issue for you, or did it get fixed in the meantime?

Thank you for your report!
However, this issue has been closed as a Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

+ Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
+ Any plugin issues need to be addressed to the creator of the plugin or resource pack.
+ If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.

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no its on a single player world

But running Optifine:

[18:28:45] [main/INFO]: Loading tweak class name optifine.OptiFineTweaker
[18:28:45] [main/INFO]: Using primary tweak class name optifine.OptiFineTweaker
[18:28:45] [main/INFO]: Calling tweak class optifine.OptiFineTweaker
[18:28:46] [main/INFO]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[18:28:47] [main/INFO]: Setting user: Darkspyro911
[18:28:52] [main/INFO]: [OptiFine] *** Reflector Forge ***
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.client.model.Attributes
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: mods.betterfoliage.client.BetterFoliageClient
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.fml.common.asm.transformers.BlamingTransformer
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.event.world.ChunkWatchEvent$UnWatch
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.fml.relauncher.CoreModManager
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.common.DimensionManager
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.client.event.GuiScreenEvent$DrawScreenEvent$Pre
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.client.event.GuiScreenEvent$DrawScreenEvent$Post
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.client.event.EntityViewRenderEvent$CameraSetup
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.client.event.EntityViewRenderEvent$FogColors
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.client.event.EntityViewRenderEvent$RenderFogEvent
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.fml.common.eventhandler.Event
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.fml.common.eventhandler.EventBus
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.fml.common.eventhandler.Event$Result
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.common.property.ExtendedBlockState
[18:28:52] [main/INFO]: [OptiFine] (Reflector) Class not present: net.minecraftforge.fml.client.FMLClientHandler