java.lang.NullPointerException: Ticking block entity
	at com.raoulvdberge.refinedstorage.apiimpl.network.node.NetworkNode.hashCode(NetworkNode.java:200)
	at java.util.HashMap.hash(Unknown Source)
	at java.util.HashMap.put(Unknown Source)
	at java.util.HashSet.add(Unknown Source)
	at com.raoulvdberge.refinedstorage.apiimpl.network.NetworkNodeGraph.lambda$rebuild$0(NetworkNodeGraph.java:54)
	at com.raoulvdberge.refinedstorage.apiimpl.network.NetworkNodeGraph.rebuild(NetworkNodeGraph.java:66)
	at com.raoulvdberge.refinedstorage.tile.TileController.func_73660_a(TileController.java:264)
	at net.minecraft.world.World.func_72939_s(World.java:1801)
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:621)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:720)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:624)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:149)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
	at java.lang.Thread.run(Unknown Source)

It's rebuilding the graph, trying to put the network node in the map, but there is no world present......

Had similar issue. Put bunch of recursive autocrafting, got outOfMemory exception, restarted world and after some time got this:

Description: Ticking entity

java.lang.ClassCastException: com.raoulvdberge.refinedstorage.tile.TileWirelessTransmitter cannot be cast to com.raoulvdberge.refinedstorage.tile.TileMultipartNode
at com.raoulvdberge.refinedstorage.block.BlockCable.hasConnectionWith(BlockCable.java:158)
at com.raoulvdberge.refinedstorage.block.BlockCable.func_176221_a(BlockCable.java:133)
at com.raoulvdberge.refinedstorage.block.BlockCable.addCollisionBoxToListDefault(BlockCable.java:232)
at mcmultipart.block.BlockCoverable.func_185477_a(BlockCoverable.java:134)
at net.minecraft.block.state.BlockStateContainer$StateImplementation.func_185908_a(BlockStateContainer.java:438)
at net.minecraft.world.World.func_184144_a(World.java:1252)
at net.minecraft.entity.Entity.func_70091_d(Entity.java:639)
at net.minecraft.entity.EntityLivingBase.func_70612_e(EntityLivingBase.java:1795)
at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2217)
at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:577)
at net.minecraft.entity.monster.EntityMob.func_70636_d(SourceFile:47)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2013)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:295)
at net.minecraft.entity.monster.EntityMob.func_70071_h_(SourceFile:52)
at ganymedes01.headcrumbs.entity.EntityHuman.func_70071_h_(EntityHuman.java:161)
at net.minecraft.world.World.func_72866_a(World.java:1964)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:839)
at net.minecraft.world.World.func_72870_g(World.java:1934)
at net.minecraft.world.World.func_72939_s(World.java:1750)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:620)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
at java.lang.Thread.run(Thread.java:745)

Had same issue with External Storage, Exporter and Crafting monitor, after deleting them with NBTExplorer, got crash few seconds after starting server

Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at mcmultipart.block.BlockCoverable.func_185477_a(BlockCoverable.java:139)
(and many more lines)

I can post entire crash log with world save (before messing with NBTExplorer

MC 1.10, SkyFactory 3.0.4 modpack, but same thing happens on 3.0.6

EDIT: first exception with ticking entity... it was mini Soaryn

Update to the latest RS version, it fixes the cable crashes.