Cleared the log, rebooted MC, joined the server and instantly it came up with the spamming errors when entering an inventory and NEI pops up. See from line 45149 till end of file.

Full log:
http://www.swe-gaming.com/paste.txt

[23:20:30] [NEI Item Filtering/ERROR] [FML]: Exception caught during firing event net.minecraftforge.event.entity.player.ItemTooltipEvent@5d7357bc: java.lang.NullPointerException at cpw.mods.fml.common.registry.GameRegistry$UniqueIdentifier.<init>(GameRegistry.java:389) ~[GameRegistry$UniqueIdentifier.class:?] at cpw.mods.fml.common.registry.GameData.getUniqueName(GameData.java:239) ~[GameData.class:?] at cpw.mods.fml.common.registry.GameRegistry.findUniqueIdentifierFor(GameRegistry.java:462) ~[GameRegistry.class:?] at tombenpotter.sanguimancy.util.EventHandler$ClientEventHandler.onSanguimancyItemTooltip(EventHandler.java:402) ~[EventHandler$ClientEventHandler.class:1.7.10-1.1.9-35] at cpw.mods.fml.common.eventhandler.ASMEventHandler_2138_ClientEventHandler_onSanguimancyItemTooltip_ItemTooltipEvent.invoke(.dynamic) ~[?:?] at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54) ~[ASMEventHandler.class:?] at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140) [EventBus.class:?] at net.minecraftforge.event.ForgeEventFactory.onItemTooltip(ForgeEventFactory.java:169) [ForgeEventFactory.class:?] at net.minecraft.item.ItemStack.func_82840_a(ItemStack.java:626) [add.class:?] at codechicken.nei.guihook.GuiContainerManager.itemDisplayNameMultiline(GuiContainerManager.java:119) [GuiContainerManager.class:?] at codechicken.nei.guihook.GuiContainerManager.concatenatedDisplayName(GuiContainerManager.java:162) [GuiContainerManager.class:?] at codechicken.nei.api.ItemInfo.getSearchName(ItemInfo.java:529) [ItemInfo.class:?] at codechicken.nei.ItemList$PatternItemFilter.matches(ItemList.java:65) [ItemList$PatternItemFilter.class:?] at codechicken.nei.ItemList$AnyMultiItemFilter.matches(ItemList.java:110) [ItemList$AnyMultiItemFilter.class:?] at codechicken.nei.ItemList$AllMultiItemFilter.matches(ItemList.java:85) [ItemList$AllMultiItemFilter.class:?] at codechicken.nei.ItemList$2.execute(ItemList.java:239) [ItemList$2.class:?] at codechicken.nei.RestartableTask$1.run(RestartableTask.java:24) [RestartableTask$1.class:?]