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So basically if i join a minecraft server or play on a singleplayer everytime i type "/" in chat and hold shift , the game crashes. Does anyone know how to fix the problem?

The game crashed whilst updating screen events
Error: java.lang.NullPointerException: Updating screen events

---- Minecraft Crash Report ----

WARNING: coremods are present:
Main (OldAnimationsMod v2.4.2 FORGE MC1.8.9.jar)
PlayerAPIPlugin (Player-API-Core-1.8.9.jar)
Contact their authors BEFORE contacting forge

// Oh - I know what I did wrong!

Time: 4/14/18 11:54 AM
Description: Updating screen events

java.lang.NullPointerException: Updating screen events
at net.minecraft.command.ComowndBase.func_71523_a(CommandBase.java:634)
at net.minecraft.command.CommandHandler.func_180524_a(CommandHandler.java:162)
at net.minecraftforge.client.ClientCommandHandler.autoComplete(ClientCommandHandler.java:116)
at net.minecraft.client.gui.GuiChat.func_146405_a(GuiChat.java:225)
at net.minecraft.client.gui.GuiChat.func_146404_p_(GuiChat.java:190)
at net.minecraft.client.gui.GuiChat.func_73869_a(GuiChat.java:71)
at net.minecraft.client.gui.GuiScreen.func_146282_l(GuiScreen.java:577)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:533)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1674)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1024)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)


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

-- Head --
Stacktrace:
at net.minecraft.command.CommandBase.func_71523_a(CommandBase.java:634)
at net.minecraft.command.CommandHandler.func_180524_a(CommandHandler.java:162)
at net.minecraftforge.client.ClientCommandHandler.autoComplete(ClientCommandHandler.java:116)
at net.minecraft.client.gui.GuiChat.func_146405_a(GuiChat.java:225)
at net.minecraft.client.gui.GuiChat.func_146404_p_(GuiChat.java:190)
at net.minecraft.client.gui.GuiChat.func_73869_a(GuiChat.java:71)
at net.minecraft.client.gui.GuiScreen.func_146282_l(GuiScreen.java:577)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:533)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiChat

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP'Jerdani'/0, l='MpServer', x=384.10, y=56.00, z=-632.63]]
Chunk stats: MultiplayerChunkCache: 289, 289
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: 398.00,4.00,-640.00 - World: (398,4,-640), Chunk: (at 14,0,0 in 24,-40; contains blocks 384,0,-640 to 399,255,-625), Region: (0,-2; contains chunks 0,-64 to 31,-33, blocks 0,0,-1024 to 511,255,-513)
Level time: 840 game time, 840 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 1 total; [EntityPlayerSP'Jerdani'/0, l='MpServer', x=384.10, y=56.00, z=-632.63]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:417)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2536)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:370)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.8.9
Operating System: Windows 7 (amd64) version 6.1
CPU: 2x Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 452354688 bytes (431 MB) / 822083584 bytes (784 MB) up to 1073741824 bytes (1024 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.19 Powered by Forge 11.15.1.1722 Optifine OptiFine_1.8.9_HD_U_I7 22 mods loaded, 22 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1722.jar)
UCHIJAAAA Forge{11.15.1.1722} [Minecraft Forge] (forge-1.8.9-11.15.1.1722.jar)
UCHIJAAAA oldanimations{2.4.2} [OldAnimationsMod] (minecraft.jar)
UCHIJAAAA PlayerAPI{1.0} [Player API] (minecraft.jar)
UCHIJAAAA ingameserverswitcher{1.0} [Ingame Server Switcher] ((1.8.9) IngameServerSwitcher.jar)
UCHIJAAAA bspkrsCore{7.01} [bspkrsCore] ([1.8.9] BspkrsCore.jar)
UCHIJAAAA customskymod{1.0} [Custom Sky Mod] ([1.8.9] customskymod.jar)
UCHIJAAAA PingTag{3.0} [Ping Tag] ([1.8.9] Ping Tag Mod-3.0.jar)
UCHIJAAAA Powns ArmorStatus HUD{1.0} [powns-armorhud] ([1.8.9] Powns ArmorStatus HUD - 1.1.jar)
UCHIJAAAA pownscoordshud{1.0} [Powns' Coords HUD] ([1.8.9] Powns Coords HUD - 1.0.jar)
UCHIJAAAA ToggleSneak{3.1.4} [ToggleSneak] ([1.8.9] Powns ToggleSneak Edit V1.1.jar)
UCHIJAAAA StatusEffectHUD{1.27} [StatusEffectHUD] ([1.8.9] StatusEffectHUD.jar)
UCHIJAAAA sidebarmod{1.01} [SidebarMod] ([1.8.9]SidebarMod-1.01.jar)
UCHIJAAAA keystrokesmod{1.0-SNAPSHOT} [KeystrokesMod] (KeystrokesMod-v4 [1.8.9].jar)
UCHIJAAAA LunatriusCore{1.1.2.32} [LunatriusCore] (LunatriusCore-1.8.9.jar)
UCHIJAAAA ProjectL{0.2} [ProjectL] (ProjectL-0.2.jar)
UCHIJAAAA ResourcePackOrganizer{1.0.3} [Resource Pack Organizer] (ResourcePackOrganizer MC-1.8.9 v1.0.3.jar)
UCHIJAAAA Schematica{1.7.7.143} [Schematica] (Schematica-1.8.9-1.7.7.143-universal.jar)
UCHIJAAAA LEVEL_HEAD{4.1.1} [Sk1er Level Head] (Sk1er Levelhead (1.8.9)-4.1.1.jar)
UCHIJAAAA timechanger{1.0} [TimeChanger] (TimeChanger-1.0 (1.8.9).jar)
Loaded coremods (and transformers):
Main (OldAnimationsMod v2.4.2 FORGE MC1.8.9.jar)
com.spiderfrog.main.ClassTransformer
PlayerAPIPlugin (Player-API-Core-1.8.9.jar)
api.player.forge.PlayerAPITransformer
GL info: ' Vendor: 'NVIDIA Corporation' Version: '3.3.0' Renderer: 'GeForce 210/PCIe/SSE2'
Launched Version: 1.8.9-forge1.8.9-11.15.1.1722
LWJGL: 2.9.4
OpenGL: GeForce 210/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
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: No
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 2x Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz
OptiFine Version: OptiFine_1.8.9_HD_U_I7
Render Distance Chunks: 8
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 3.3.0
OpenGlRenderer: GeForce 210/PCIe/SSE2
OpenGlVendor: NVIDIA Corporation
CpuCount: 2