net.minecraft.util.ReportedException: Updating screen events
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1805) ~[Minecraft.class:?]
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1119) ~[Minecraft.class:?]
	at net.minecraft.client.Minecraft.run(Minecraft.java:407) [Minecraft.class:?]
	at net.minecraft.client.main.Main.main(Main.java:118) [Main.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_131]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_131]
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
	at GradleStart.main(GradleStart.java:26) [start/:?]
Caused by: java.lang.NullPointerException
	at net.minecraft.inventory.Container.slotClick(Container.java:263) ~[Container.class:?]
	at net.minecraft.client.multiplayer.PlayerControllerMP.windowClick(PlayerControllerMP.java:595) ~[PlayerControllerMP.class:?]
	at net.minecraft.client.gui.inventory.GuiContainer.handleMouseClick(GuiContainer.java:687) ~[GuiContainer.class:?]
	at net.minecraft.client.gui.inventory.GuiContainer.mouseClicked(GuiContainer.java:429) ~[GuiContainer.class:?]
	at net.minecraft.client.gui.GuiScreen.handleMouseInput(GuiScreen.java:615) ~[GuiScreen.class:?]
	at net.minecraft.client.gui.GuiScreen.handleInput(GuiScreen.java:580) ~[GuiScreen.class:?]
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1792) ~[Minecraft.class:?]
	... 15 more
[15:46:12] [Client thread/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:600]: ---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 6/25/17 3:46 PM
Description: Updating screen events

java.lang.NullPointerException: Updating screen events
	at net.minecraft.inventory.Container.slotClick(Container.java:263)
	at net.minecraft.client.multiplayer.PlayerControllerMP.windowClick(PlayerControllerMP.java:595)
	at net.minecraft.client.gui.inventory.GuiContainer.handleMouseClick(GuiContainer.java:687)
	at net.minecraft.client.gui.inventory.GuiContainer.mouseClicked(GuiContainer.java:429)
	at net.minecraft.client.gui.GuiScreen.handleMouseInput(GuiScreen.java:615)
	at net.minecraft.client.gui.GuiScreen.handleInput(GuiScreen.java:580)
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1792)
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1119)
	at net.minecraft.client.Minecraft.run(Minecraft.java:407)
	at net.minecraft.client.main.Main.main(Main.java:118)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)


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

-- Head --
Thread: Client thread
Stacktrace:
	at net.minecraft.inventory.Container.slotClick(Container.java:263)
	at net.minecraft.client.multiplayer.PlayerControllerMP.windowClick(PlayerControllerMP.java:595)
	at net.minecraft.client.gui.inventory.GuiContainer.handleMouseClick(GuiContainer.java:687)
	at net.minecraft.client.gui.inventory.GuiContainer.mouseClicked(GuiContainer.java:429)
	at net.minecraft.client.gui.GuiScreen.handleMouseInput(GuiScreen.java:615)
	at net.minecraft.client.gui.GuiScreen.handleInput(GuiScreen.java:580)

-- Affected screen --
Details:
	Screen name: com.walkingdead.walkingdeadmod.items.backpack.GuiWindow

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [EntityPlayerSP['Player856'/120, l='MpServer', x=-735.43, y=6.12, z=628.19]]
	Chunk stats: MultiplayerChunkCache: 727, 727
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options:
	Level spawn location: World: (-734,4,621), Chunk: (at 2,0,13 in -46,38; contains blocks -736,0,608 to -721,255,623), Region: (-2,1; contains chunks -64,32 to -33,63, blocks -1024,0,512 to -513,255,1023)
	Level time: 221823 game time, 45873 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 49 total; [EntityCreeper['Creeper'/11, l='MpServer', x=-800.79, y=4.00, z=564.15], EntitySkeleton['Skeleton'/12, l='MpServer', x=-808.41, y=4.00, z=602.70], EntitySkeleton['Skeleton'/13, l='MpServer', x=-811.78, y=4.00, z=654.28], EntitySkeleton['Skeleton'/15, l='MpServer', x=-807.32, y=4.00, z=690.79], EntitySpider['Spider'/17, l='MpServer', x=-806.95, y=4.00, z=705.77], EntityChicken['Chicken'/20, l='MpServer', x=-789.11, y=4.00, z=569.92], EntityItem['item.item.egg'/21, l='MpServer', x=-789.05, y=4.00, z=571.18], EntitySpider['Spider'/22, l='MpServer', x=-798.50, y=4.00, z=573.50], EntityCow['Cow'/23, l='MpServer', x=-785.45, y=4.00, z=609.66], EntityCreeper['Creeper'/24, l='MpServer', x=-791.10, y=4.00, z=619.73], EntityCreeper['Creeper'/25, l='MpServer', x=-797.16, y=4.00, z=629.59], EntitySkeleton['Skeleton'/26, l='MpServer', x=-785.19, y=4.00, z=639.72], EntitySkeleton['Skeleton'/27, l='MpServer', x=-794.28, y=4.00, z=642.57], EntityCreeper['Creeper'/31, l='MpServer', x=-777.82, y=4.00, z=630.23], EntityCreeper['Creeper'/32, l='MpServer', x=-776.71, y=4.00, z=628.19], EntityZombie['Zombie'/33, l='MpServer', x=-782.18, y=4.00, z=648.32], EntityCreeper['Creeper'/34, l='MpServer', x=-769.25, y=4.00, z=669.18], EntityChicken['Chicken'/36, l='MpServer', x=-782.80, y=4.00, z=693.63], EntitySpider['Spider'/40, l='MpServer', x=-753.00, y=4.00, z=591.43], EntityChicken['Chicken'/41, l='MpServer', x=-752.48, y=4.00, z=687.50], EntityItem['item.item.egg'/42, l='MpServer', x=-752.94, y=4.00, z=687.42], EntitySlime['Slime'/44, l='MpServer', x=-742.16, y=4.00, z=595.87], EntitySlime['Slime'/45, l='MpServer', x=-749.72, y=4.00, z=603.42], EntitySlime['Slime'/46, l='MpServer', x=-751.10, y=4.00, z=617.85], EntitySlime['Slime'/47, l='MpServer', x=-754.07, y=5.25, z=634.55], EntityCreeper['Creeper'/48, l='MpServer', x=-739.32, y=4.00, z=665.16], EntitySkeleton['Skeleton'/49, l='MpServer', x=-747.55, y=4.00, z=701.68], EntityZombie['Zombie'/50, l='MpServer', x=-732.52, y=4.00, z=705.51], EntityCreeper['Creeper'/52, l='MpServer', x=-733.50, y=4.00, z=553.50], EntitySlime['Slime'/53, l='MpServer', x=-730.59, y=4.00, z=638.29], EntitySkeleton['Skeleton'/54, l='MpServer', x=-739.21, y=4.00, z=668.28], EntitySlime['Slime'/55, l='MpServer', x=-727.32, y=4.00, z=665.48], EntityCreeper['Creeper'/59, l='MpServer', x=-711.20, y=4.00, z=558.72], EntityPig['Pig'/60, l='MpServer', x=-704.22, y=4.00, z=646.60], EntitySheep['Sheep'/61, l='MpServer', x=-709.63, y=4.00, z=669.19], EntityCreeper['Creeper'/62, l='MpServer', x=-692.45, y=4.00, z=554.16], Entityrunner['Runner'/64, l='MpServer', x=-702.37, y=4.00, z=649.64], Entitymedical['Medical'/65, l='MpServer', x=-702.65, y=4.00, z=657.76], EntitySkeleton['Skeleton'/66, l='MpServer', x=-682.30, y=4.00, z=689.57], EntitySkeleton['Skeleton'/71, l='MpServer', x=-681.70, y=4.00, z=673.79], EntitySkeleton['Skeleton'/72, l='MpServer', x=-682.55, y=4.00, z=683.69], EntityPig['Pig'/78, l='MpServer', x=-661.76, y=4.00, z=568.54], EntitySkeleton['Skeleton'/79, l='MpServer', x=-657.56, y=4.00, z=561.31], EntityPlayerSP['Player856'/120, l='MpServer', x=-735.43, y=6.12, z=628.19], EntityZombie['Zombie'/80, l='MpServer', x=-659.79, y=4.00, z=576.45], EntitySheep['Sheep'/81, l='MpServer', x=-668.25, y=4.00, z=675.48], EntityCreeper['Creeper'/82, l='MpServer', x=-663.42, y=4.00, z=692.78], EntitySpider['Spider'/83, l='MpServer', x=-661.60, y=4.00, z=703.42], EntityCreeper['Creeper'/84, l='MpServer', x=-662.77, y=4.00, z=701.81]]
	Retry entities: 0 total; []
	Server brand: fml,forge
	Server type: Integrated singleplayer server
Stacktrace:
	at net.minecraft.client.multiplayer.WorldClient.addWorldInfoToCrashReport(WorldClient.java:456)
	at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:2774)
	at net.minecraft.client.Minecraft.run(Minecraft.java:428)
	at net.minecraft.client.main.Main.main(Main.java:118)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)