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I tried to spawn an air block item on the ground, and it crashed!

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 7/5/14 12:12 PM
Description: Updating screen events

java.lang.NullPointerException: Updating screen events
at person.mister.auw.GuiPickEntity$21.save(GuiPickEntity.java:2076)
at person.mister.auw.GuiModifySlot.func_146284_a(GuiModifySlot.java:482)
at person.mister.auw.GuiWithTextBoxes.func_73864_a(GuiWithTextBoxes.java:68)
at person.mister.auw.GuiModifySlot.func_73864_a(GuiModifySlot.java:754)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:301)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1579)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:916)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:835)
at net.minecraft.client.main.Main.main(SourceFile:103)
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:134)
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 person.mister.auw.GuiPickEntity$21.save(GuiPickEntity.java:2076)
at person.mister.auw.GuiModifySlot.func_146284_a(GuiModifySlot.java:482)
at person.mister.auw.GuiWithTextBoxes.func_73864_a(GuiWithTextBoxes.java:68)
at person.mister.auw.GuiModifySlot.func_73864_a(GuiModifySlot.java:754)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:301)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)

-- Affected screen --
Details:
Screen name: ~~NULL~~

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['creeperman495'/1, l='MpServer', x=609.67, y=57.62, z=-548.05]]
Chunk stats: MultiplayerChunkCache: 271, 271
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (581,4,-538), Chunk: (at 5,0,6 in 36,-34; contains blocks 576,0,-544 to 591,255,-529), Region: (1,-2; contains chunks 32,-64 to 63,-33, blocks 512,0,-1024 to 1023,255,-513)
Level time: 175865 game time, 486354 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: 3 total; [EntityClientPlayerMP['creeperman495'/1, l='MpServer', x=606.27, y=57.62, z=-541.04], EntityClientPlayerMP['creeperman495'/1, l='MpServer', x=609.67, y=57.62, z=-548.05], EntityClientPlayerMP['creeperman495'/1, l='MpServer', x=614.84, y=57.62, z=-539.00]]
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:368)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2382)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:857)
at net.minecraft.client.main.Main.main(SourceFile:103)
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:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 59596656 bytes (56 MB) / 341491712 bytes (325 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 26 (1456 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.03 FML v7.2.204.1097 Minecraft Forge 10.12.1.1097 24 mods loaded, 24 mods active
mcp{9.03} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.2.204.1097} [Forge Mod Loader] (forge-1.7.2-10.12.1.1097.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.12.1.1097} [Minecraft Forge] (forge-1.7.2-10.12.1.1097.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.0} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
itemphysic{0.8.1} [ItemPhysic] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.0.1} [Not Enough Items] (NotEnoughItems-1.7.2-1.0.1-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
grim3212core{V0.1 - 1.7.2} [Grim3212 Core] (Grim3212-Core-V0.1-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
battlegear2{1.0.5.4} [Mine & Blade Battlegear 2 - Bullseye] (1.7.2-MB_Battlegear2-Bullseye-1.0.5.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{3.1.1} [Damage Indicators] ([1.7.2]DamageIndicatorsMod-3.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
More Crafting Recipes Mod{Minecraft 1.7.2} [More Crafting Recipes Mod] ([2.1.1] More Crafting Recipes Mod.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
examplemod{1.0} [Example Mod] (All-U-Want 2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
alluwant{2.0 beta} [All U want] (All-U-Want 2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ElementalCreepers{4.1.2} [Elemental Creepers] (Elemental Creepers-universal_1.7.2-4.1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
emeraldmod{1.0} [EmeraldMod] (EmeraldMod 1.7.2 Forge V3.3.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FreezeCam{3.5} [FreezeCam] (FreezeCam-3.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoreFurnaces{1.0} [Mo' Furnaces] (MoreFurnaces-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
moreplayermodels{1.7.2} [MorePlayerModels] (MorePlayerModels_1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
realisticpain{1.1} [Realistic Pain] (realisticpain-1.2-mc1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
securitycraft{v1.5.1} [SecurityCraft] (SecurityCraft v1.5.1 for 1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
shinyfood{1.4} [ShinyFood] (shinyfood-[1.7.2][v1.4].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
starmall{1.0} [StarMall] (starmall-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
timecontrol{V0.1 - 1.7.2} [Time Control] (TimeControl-V0.1-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
warpbook{1.0.35} [Warp Book] (warp-book-1.7.2-1.0.35.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
zoommod{1.2} [ZoomMod] (ZoomMod[1.7.2][1.2][Forge].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.7.2-Forge10.12.1.1097
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics Family GL version 3.0.0 - Build 8.15.10.2353, Intel
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)
Vec3 Pool Size: 103 (5768 bytes; 0 MB) allocated, 23 (1288 bytes; 0 MB) used
Anisotropic Filtering: Off (1)