Hey Tombenpotter! Recently I've been trying out the newer versions of Sanguimancy, and I've been getting random spontaneous crashes for no apparent reason. The report mentions your Soul Knots:

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 29/08/15 19:51
Description: Ticking memory connection

java.lang.IllegalArgumentException: Empty string not allowed
at net.minecraft.nbt.NBTTagString.(NBTTagString.java:23)
at net.minecraft.nbt.NBTTagCompound.func_74778_a(NBTTagCompound.java:105)
at tombenpotter.sanguimancy.tile.TileSimpleSNKnot.func_145841_b(TileSimpleSNKnot.java:51)
at net.minecraftforge.common.util.BlockSnapshot.(BlockSnapshot.java:52)
at net.minecraftforge.common.util.BlockSnapshot.(BlockSnapshot.java:81)
at net.minecraftforge.common.util.BlockSnapshot.getBlockSnapshot(BlockSnapshot.java:107)
at net.minecraft.world.World.func_147465_d(World.java:447)
at net.minecraft.world.World.func_147468_f(World.java:573)
at tombenpotter.sanguimancy.items.ItemTranspositionSigil.func_77648_a(ItemTranspositionSigil.java:79)
at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:505)
at net.minecraft.item.ItemStack.func_77943_a(ItemStack.java:128)
at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:389)
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:556)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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

-- Head --
Stacktrace:
at net.minecraft.nbt.NBTTagString.(NBTTagString.java:23)
at net.minecraft.nbt.NBTTagCompound.func_74778_a(NBTTagCompound.java:105)
at tombenpotter.sanguimancy.tile.TileSimpleSNKnot.func_145841_b(TileSimpleSNKnot.java:51)
at net.minecraftforge.common.util.BlockSnapshot.(BlockSnapshot.java:52)
at net.minecraftforge.common.util.BlockSnapshot.(BlockSnapshot.java:81)
at net.minecraftforge.common.util.BlockSnapshot.getBlockSnapshot(BlockSnapshot.java:107)
at net.minecraft.world.World.func_147465_d(World.java:447)
at net.minecraft.world.World.func_147468_f(World.java:573)
at tombenpotter.sanguimancy.items.ItemTranspositionSigil.func_77648_a(ItemTranspositionSigil.java:79)
at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:505)
at net.minecraft.item.ItemStack.func_77943_a(ItemStack.java:128)
at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:389)
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:556)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)

-- Ticking connection --
Details:
Connection: net.minecraft.network.NetworkManager@59cc230f
Stacktrace:
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_24, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 242770552 bytes (231 MB) / 834600960 bytes (795 MB) up to 954466304 bytes (910 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1024m -XX:MaxPermSize=128m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1448 Optifine OptiFine_1.7.10_HD_U_C1 85 mods loaded, 85 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{9.05} Minecraft Coder Pack
UCHIJAAAA FML{7.10.99.99} Forge Mod Loader
UCHIJAAAA Forge{10.13.4.1448} Minecraft Forge
UCHIJAAAA CodeChickenCore{1.0.4.29} CodeChicken Core
UCHIJAAAA InfiniBows{1.3.0 build 20} InfiniBows
UCHIJAAAA NotEnoughItems{1.0.3.74} Not Enough Items
UCHIJAAAA ThaumicTinkerer-preloader{0.1} Thaumic Tinkerer Core
UCHIJAAAA WitchingGadgetsCore{1.1.9} Witching Gadgets Core
UCHIJAAAA debug{1.0} debug
UCHIJAAAA PhaseBlocks{4.1.0} PhaseBlocks
UCHIJAAAA bspkrsCore{6.16} bspkrsCore
UCHIJAAAA ArmorStatusHUD{1.28} ArmorStatusHUD
UCHIJAAAA StartingInventory{1.7.10.r03} StartingInventory
UCHIJAAAA StatusEffectHUD{1.27} StatusEffectHUD
UCHIJAAAA Baubles{1.0.1.10} Baubles
UCHIJAAAA AlchBling{%VERSION%} Alchemical Bling
UCHIJAAAA Thaumcraft{4.2.3.5} Thaumcraft
UCHIJAAAA arcanearteries{5} [Arcane Arteries](Arcane Arteries0.6.jar)
UCHIJAAAA aura{0.1r0} Aura Cascade
UCHIJAAAA Waila{1.5.5} Waila
UCHIJAAAA Automagy{0.26.3} Automagy
UCHIJAAAA AWWayofTime{v1.3.3} Blood Magic: Alchemical Wizardry
UCHIJAAAA Botania{r1.7-217} [Botania](Botania r1.7-217.jar)
UCHIJAAAA Avaritia{0.2b} Avaritia
UCHIJAAAA CarpentersBlocks{3.3.5} [Carpenter's Blocks](Carpenter's Blocks v3.3.5 - MC 1.7.10.jar)
UCHIJAAAA ChickenChunks{1.3.4.16} ChickenChunks
UCHIJAAAA clockworkphase{1.7.10_1.0f} Clockwork Phase
UCHIJAAAA menagerie{1.0} menagerie
UCHIJAAAA Enchiridion{1.1} Enchiridion
UCHIJAAAA EE3{0.3.507} Equivalent Exchange 3
UCHIJAAAA Equivalence{1.2.0} Equivalence
UCHIJAAAA evilcraft{0.8.8} EvilCraft
UCHIJAAAA FastCraft{1.21} FastCraft
UCHIJAAAA ftfloocraft{1.7.10-1.3} Floocraft
UCHIJAAAA ThaumicTinkerer{unspecified} Thaumic Tinkerer
UCHIJAAAA ForbiddenMagic{1.7.10-0.562} [Forbidden Magic](Forbidden Magic-1.7.10-0.562.jar)
UCHIJAAAA foxlib{1.7.10-0.7.0} FoxLib
UCHIJAAAA ModGeochests{1.2.3} §aGeochests
UCHIJAAAA guideapi{1.7.10-1.0.1-20} Guide-API
UCHIJAAAA interdictionpillar{1.7.10-1.0.0} Interdiction Pillar
UCHIJAAAA inventorytweaks{1.59-dev-152-cf6e263} Inventory Tweaks
UCHIJAAAA Laundarray{0.1.1} Laundarray
UCHIJAAAA LomLib{3.2.0} LomLib
UCHIJAAAA LookingGlass{0.2.0.00} Looking Glass
UCHIJAAAA magicalcrops{4.0.0_PUBLIC_BETA_4b} Magical Crops: Core
UCHIJAAAA magicalcropsarmour{4.0.0_PUBLIC_BETA_4} Magical Crops: Armoury
UCHIJAAAA magicalcropsdeco{4.0.0_PUBLIC_BETA_4} Magical Crops: Decorative
UCHIJAAAA MineTweaker3{3.0.9B} MineTweaker 3
UCHIJAAAA Morpheus{1.7.10-1.5.26} Morpheus
UCHIJAAAA Mystcraft{0.12.3.00} Mystcraft
UCHIJAAAA NaturalAbsorption{1.2.1} Natural Absorption
UCHIJAAAA necromancy{1.7.1} Necromancy
UCHIJAAAA NEIAddons{1.12.5.17} NEI Addons
UCHIJAAAA NEIAddons|Botany{1.12.5.17} NEI Addons: Botany
UCHIJAAAA NEIAddons|Forestry{1.12.5.17} NEI Addons: Forestry
UCHIJAAAA NEIAddons|CraftingTables{1.12.5.17} NEI Addons: Crafting Tables
UCHIJAAAA NEIAddons|ExNihilo{1.12.5.17} NEI Addons: Ex Nihilo
UCHIJAAAA NodalMechanics{1.7.10R1.0} NodalMechanics
UCHIJAAAA recallstones{0.5.2} Recall Stones
UCHIJAAAA libsandstone{1.0.0} libsandstone
UCHIJAAAA xreliquary{1.2} Reliquary
UCHIJAAAA Sanguimancy{1.7.10-1.1.9-32} Sanguimancy
UCHIJAAAA SanguineExtras{1.3.2} [Sanguine Utilities](Sanguine Utilities-1.3.2.jar)
UCHIJAAAA simplecondenser{1.2.0} [Simple Condensers](Simple Condensers-1.7.10-1.2.0-universal.jar)
UCHIJAAAA SSTOW{1.7.10-0.1-RC9-7} Soul Shards: The Old Ways
UCHIJAAAA StorageDrawers{1.7.10-1.5.12} Storage Drawers
UCHIJAAAA Tails{1.7.10-1.3.0} Tails
UCHIJAAAA TaintedMagic{1.1.5.7} Tainted Magic
UCHIJAAAA tfsimplymagic{0.2.0} TF Simply Magic
UCHIJAAAA ThaumcraftMobAspects{1.7.2-2A} Thaumcraft Mob Aspects
UCHIJAAAA thaumcraftneiplugin{1.7.10-1.7} Thaumcraft NEI Plugin
UCHIJAAAA ThaumicExploration{0.6.0} Thaumic Exploration
UCHIJAAAA ThaumicHorizons{1.1.5} Thaumic Horizons
UCHIJAAAA thaumicinfusion{4.05} Thaumic Infusion
UCHIJAAAA Translocator{1.1.1.14} Translocator
UCHIJAAAA TravellersGear{1.16.4} Traveller's Gear
UCHIJAAAA TwilightForest{2.3.7} The Twilight Forest
UCHIJAAAA UtilityMobs{3.1.1} Utility Mobs
UCHIJAAAA VillagersNose{1.3a} Villager's Nose
UCHIJAAAA WailaHarvestability{1.1.0} Waila Harvestability
UCHIJAAAA wiiemc{1.0.1} What Is Its EMC?
UCHIJAAAA witchery{0.24.1} Witchery
UCHIJAAAA WitchingGadgets{1.1.9} Witching Gadgets
UCHIJAAAA aobd{2.8.1} Another One Bites The Dust
UCHIJAAAA denseores{1.0} Dense Ores
GL info: ERROR RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['SkullyGamingMC'/1228, l='Test World', x=199.79, y=4.00, z=280.58]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'