Happened a few times to me rescently, i can’t figure out what exactly is causing it, but it happens randomly (as in, most of the times it doesn’t) when i load one of my worlds.

2012-07-14 17:12:43 [SEVERE] A critical error has occurred.
java.lang.NullPointerException
at buildcraft.krapht.logistics.LogisticsManagerV2.getBestReply(LogisticsManagerV2.java:52)
at buildcraft.krapht.logistics.LogisticsManagerV2.assignDestinationFor(LogisticsManagerV2.java:96)
at buildcraft.logisticspipes.RouteLayer.getOrientationForItem(RouteLayer.java:37)
at buildcraft.krapht.PipeTransportLogistics.resolveDestination(PipeTransportLogistics.java:116)
at buildcraft.transport.PipeTransportItems.moveSolids(PipeTransportItems.java:228)
at buildcraft.transport.PipeTransportItems.updateEntity(PipeTransportItems.java:181)
at buildcraft.krapht.PipeTransportLogistics.updateEntity(PipeTransportLogistics.java:71)
at buildcraft.transport.Pipe.updateEntity(Pipe.java:245)
at buildcraft.krapht.CoreRoutedPipe.updateEntity(CoreRoutedPipe.java:143)
at buildcraft.krapht.pipes.PipeLogisticsChassi.updateEntity(PipeLogisticsChassi.java:244)
at buildcraft.transport.TileGenericPipe.n_(TileGenericPipe.java:145)
at xd.n(World.java:2081)
at net.minecraft.client.Minecraft.k(Minecraft.java:1867)
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)
2012-07-14 17:12:43 [SEVERE] 35 mods loaded
Optifine OptiFine_1.2.5_HD_S_C3
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_ReiMinimap : Available (minecraft.jar)
mod_NotEnoughItems : Available (minecraft.jar)
mod_MinecraftForge : Available (minecraft.jar)
mod_BE : Available (minecraft.jar)
mod_Somnia : Available ([1.2.5] Somnia v23.zip)
mod_IC2 : Available (industrialcraft-2-client_1.97.jar)
mod_AdvancedMachines : Available (AdvancedMachinesClient v1.5.zip)
mod_AdditionalBuildcraftObjects : Available (buildcraft-C-additionalbuildcraftobjects-f301@75bc315-97.zip)
mod_BuildCraftCore : Available (buildcraft-client-A-core-3.1.5.zip)
mod_BuildCraftBuilders : Available (buildcraft-client-B-builders-3.1.5.zip)
mod_BuildCraftEnergy : Available (buildcraft-client-B-energy-3.1.5.zip)
mod_BuildCraftFactory : Available (buildcraft-client-B-factory-3.1.5.zip)
mod_BuildCraftTransport : Available (buildcraft-client-B-transport-3.1.5.zip)
mod_BuildcraftAPS : Available (buildcraft-client-C-APS FR3.1.0-BC3.1.5.zip)
mod_BuildCraftSilicon : Available (buildcraft-client-C-silicon-3.1.5.zip)
mod_AdditionalPipes : Available (buildcraft-client-DA-additionalpipes-3.1.0.zip)
mod_cjb_main : Available (CJB_MAIN.zip)
mod_cjb_moreinfo : Available (CJB_MOREINFO.zip)
mod_cjb_x_ray : Available (CJB_XRAY.zip)
mod_CraftingTableIII : Available (CraftingTableIIIB1.8.zip)
mod_EE : Available (EE2ClientV1.4.6.6.jar)
mod_RedPowerWorld : Available (RedPowerWorld-2.0pr5b2.zip)
mod_Forestry : Available (forestry-client-A-1.4.8.4.jar)
mod_InvTweaks : Available (InvTweaks-1.41b-1.2.4.zip)
mod_PigbearLaser : Available (Laser Mod 1.5.zip)
mod_LogisticsPipes : Available (LogisticsPipes-BC3-0.2.5A.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_Transformers : Available (TransformersClient v1.3.zip)
mod_ThaumCraft : Available (ThaumCraft2.1.6d.zip)