Mon Minecraft crash !!!

Bonjour,
Depuis aujourd'hui mon minecraft crash lorsque j'ouvre mon monde mais je ne comprends pas pourquoi : AIDEZ MOI PLEASE !!!!
VOICI LES DETAILS :

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 14/01/17 22:45
Description: Ticking memory connection

java.lang.NullPointerException: Ticking memory connection
at awh.a(SourceFile:41)
at awd.a(SourceFile:94)
at atn.b(SourceFile:433)
at asf.a(SourceFile:804)
at asf.a(SourceFile:792)
at lp.b(SourceFile:86)
at lv.<init>(SourceFile:40)
at lw.c(SourceFile:196)
at lw.a(SourceFile:227)
at mn.a(SourceFile:274)
at mn.c(SourceFile:330)
at mn.a(SourceFile:160)
at me.b(SourceFile:116)
at me.c(SourceFile:62)
at em.a(SourceFile:232)
at mb.c(SourceFile:187)
at net.minecraft.server.MinecraftServer.D(SourceFile:644)
at net.minecraft.server.MinecraftServer.C(SourceFile:554)
at byl.C(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)


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

-- Head --
Thread: Server thread
Stacktrace:
at awh.a(SourceFile:41)
at awd.a(SourceFile:94)
at atn.b(SourceFile:433)
at asf.a(SourceFile:804)
at asf.a(SourceFile:792)
at lp.b(SourceFile:86)
at lv.<init>(SourceFile:40)
at lw.c(SourceFile:196)
at lw.a(SourceFile:227)
at mn.a(SourceFile:274)
at mn.c(SourceFile:330)
at mn.a(SourceFile:160)
at me.b(SourceFile:116)
at me.c(SourceFile:62)
at em.a(SourceFile:232)

-- Ticking connection --
Details:
Connection: em@3ff980
Stacktrace:
at mb.c(SourceFile:187)
at net.minecraft.server.MinecraftServer.D(SourceFile:644)
at net.minecraft.server.MinecraftServer.C(SourceFile:554)
at byl.C(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
Minecraft Version: 1.9.4
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 87532776 bytes (83 MB) / 276590592 bytes (263 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [ls['MarOne_'/133, l='Nouveau monde', x=2,82, y=65,00, z=137,47]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.