InvTweaks + Forestry Backpacks Scrolling Crash

If you attempt to "scroll" items out of a Forestry Backpack, there is a client crash.

Scrolling items is such a useful feature of InvTweaks that it has become second nature and I do it without thinking, and I find myself constantly crashing because of this bug. Not too serious, but rather annoying.

 

Same bug experienced when attempting to scroll scrap out of a mass fab;

Spoiler

java.lang.NullPointerException
at ic2.common.SlotMatterScrap.a(SlotMatterScrap.java:16)
at codechicken.nei.FastTransferManger.transferItem(FastTransferManger.ja
va:211)
at codechicken.nei.NEIController.onMouseWheel(NEIController.java:499)
at gb.f(GuiContainer.java:429)
at vp.i(SourceFile:110)
at gb.i(GuiContainer.java:419)
at net.minecraft.client.Minecraft.k(Minecraft.java:1567)
at net.minecraft.client.Minecraft.x(Minecraft.java:822)
at net.minecraft.client.Minecraft.run(Minecraft.java:750)
at java.lang.Thread.run(Unknown Source)
2012-07-24 18:16:46 [SEVERE] A critical error has occurred.
java.lang.NullPointerException
at ic2.common.SlotMatterScrap.a(SlotMatterScrap.java:16)
at codechicken.nei.FastTransferManger.transferItem(FastTransferManger.ja
va:211)
at codechicken.nei.NEIController.onMouseWheel(NEIController.java:499)
at gb.f(GuiContainer.java:429)
at vp.i(SourceFile:110)
at gb.i(GuiContainer.java:419)
at net.minecraft.client.Minecraft.k(Minecraft.java:1567)
at net.minecraft.client.Minecraft.x(Minecraft.java:822)
at net.minecraft.client.Minecraft.run(Minecraft.java:750)
at java.lang.Thread.run(Unknown Source)
2012-07-24 18:16:46 [SEVERE] 46 mods loaded
SKCraft Industrial v6.1-1.2.5 ("HARVEST")
Optifine OptiFine_1.2.5_HD_C4
Minecraft Forge 3.3.8.152
FML v2.2.78.153
Forge Mod Loader version 2.2.78.153 for Minecraft 1.2.5
mod_CodeChickenCore : Available (minecraft.jar)
mod_BuildCraftCore : Available (minecraft.jar)
mod_BuildCraftEnergy : Available (minecraft.jar)
mod_WorldEditCUI : Available (minecraft.jar)
mod_ImmibisCore : Available (minecraft.jar)
mod_NotEnoughItems : Available (minecraft.jar)
mod_MinecraftForge : Available (minecraft.jar)
mod_BuildCraftFactory : Available (minecraft.jar)
mod_BuildCraftTransport : Available (minecraft.jar)
mod_BuildCraftBuilders : Available (minecraft.jar)
mod_JammyFurniture : Available (1.2.5_Jammy_Furniture_Mod_Client_V3.6.zi
p)
mod_ReiMinimap : Available ([1.2.5]ReiMinimap_v3.2_04.zip)
mod_AdditionalBuildcraftObjects : Available (ABO-0.9.1-Client.zip)
mod_IC2 : Available (industrialcraft-2-client_1.97.jar)
mod_IC2AdvancedMachines : Available (AdvancedMachines_4.0_client.zip)
mod_MetallurgyFishing : Available (Aquaculture 1.1.2 Client.zip)
mod_BetterFarming : Available (Better Farming 2.4.0 Forge.zip)
mod_AdditionalPipes : Available (buildcraft-client-DA-additionalpipes-2.
1.3.zip)
mod_ComputerCraft : Available (ComputerCraft)
mod_CCTurtle : Available (ComputerCraft)
mod_RedPowerWorld : Available (RedPowerWorld-2.0pr5b2.zip)
mod_Forestry : Available (forestry-client-A-1.4.8.4_bc2.2.jar)
mod_GregsLighting : Available (GregsLighting-Client.jar)
mod_HelperCrops : Available (HelperCrops-4.0.zip)
mod_HotAirBalloons : Available (Hot Air Balloons - MP Client - 1.2.5 - v
2.1.zip)
mod_IC2NuclearControl : Available (IC2NuclearControl_client_v1.1.10b.zip
)
mod_Infestation : Available (Infestation_0.1.18_lite.zip)
mod_InvTweaks : Available (InvTweaks-1.41b-1.2.4.zip)
mod_IC2_ChargingBench : Available (mod_chargingbench-client-1.95b-1.2.5-
r2.zip)
mod_IronChest : Available (mod_ironchests-client-3.8.0.40.zip)
mod_Paintball : Available (Paintball_client.zip)
mod_Pamdesertcraft : Available (Pam's DesertCraft 1.7 (MC 1.2.4) - Combi
ned.zip)
mod_Pamfood : Available (Pam's Harvestcraft 5.3.8.2 (MC 1.2.5) - Combine
d.zip)
mod_PowerConverters : Available (PowerConverters_Client_1.3.4.zip)
mod_Railcraft : Available (Railcraft_Client_5.3.3.zip)
mod_RedPowerControl : Available (RedPowerControl-2.0pr5b2.zip)
mod_RedPowerCore : Available (RedPowerCore-2.0pr5b2.zip)
mod_RedPowerLighting : Available (RedPowerLighting-2.0pr5b2.zip)
mod_RedPowerLogic : Available (RedPowerLogic-2.0pr5b2.zip)
mod_RedPowerMachine : Available (RedPowerMachine-2.0pr5b2.zip)
mod_RedPowerWiring : Available (RedPowerWiring-2.0pr5b2.zip)
mod_TubeStuff : Available (tubestuff_49.1.1_for_1.2.5-client.jar)
mod_WirelessRedstoneCore : Available (WR-CBE Core-Client 1.2.2.3.zip)
mod_WirelessRedstoneRedPower : Available (WR-CBE RedPower-Client 1.2.2.1
.zip)
mod_PluginsforForestry : Available (PluginsforForestry1.1c_Client_no_for
estry.jar)
mod_SeedManager : Available (SeedManager-2.0.zip)