Ground flickers to where I can see caves and the game just closed

Latele I've started playing again and my game runs fine for a while then after a bit the ground starts to flicker or even disappear allowing me to see all the caves nearby(which can be kind of useful I found a dungeon this way) The longer I let this happen the more it happens until the game freezes. I found that when it happens I can just save and quit and then open that save again and the issue resolves itself. I did that and then I noticed a torch I placed was invisible so I decided to quit and open again but when I clicked the save file to open it the game crashed. This is all I know and I don't even know if the crash was related to the other problem. I do have a sneaking suspicion that these problems were caused by updating my Java.

What I expected to happen was...:
to open my save file and continue playing

What actually happened was...:
the game closed and offered me a crash report as follows

Minecraft Crash Report ----
// Shall we play a game?

Time: 12/4/16 2:42 AM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at ajq.a(SourceFile:1240)
at bqc.h(SourceFile:1614)
at bqc.a(SourceFile:1203)
at bqc.b(SourceFile:1188)
at bqc.a(SourceFile:1033)
at beq.av(SourceFile:990)
at beq.a(SourceFile:395)
at net.minecraft.client.main.Main.main(SourceFile:124)

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

– Head –
Thread: Client thread
Stacktrace:
at ajq.a(SourceFile:1240)
at bqc.h(SourceFile:1614)
at bqc.a(SourceFile:1203)
at bqc.b(SourceFile:1188)

– Affected level –
Details:
Level name: MpServer
All players: 0 total; []
Chunk stats: MultiplayerChunkCache: 0, 0
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 0 game time, 0 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 0 total; []
Retry entities: 0 total; []
Server brand: ~_ERROR~ NullPointerException: null
Server type: Integrated singleplayer server
Stacktrace:
at bno.a(SourceFile:365)
at beq.b(SourceFile:2536)
at beq.a(SourceFile:409)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.11
Operating System: Windows 10 (x86) version 10.0
Java Version: 1.8.0_111, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 246495832 bytes (235 MB) / 425463808 bytes (405 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: 12, tallocated: 94
Launched Version: 1.11
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.4358, Intel
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 Intel(R) Core(TM) i3-3110M CPU @ 2.40GHz

Steps to Reproduce:
No clue. Sorry.