Server Repeatedly Crashing When Certain Users Join

[m1dude]

Sometimes a player on the server will go somewhere (I don't know where) and will crash the server and their client.  They also crash the server everytime they login until I delete their player data.  I do not know if it is a chunk error but I have used mcedit and attempted to repair all of the chunks.  This is a somewhat recent error and I do not know what is causing it.  Could someone help me?  Here is a cutout of the most recent crash error in console:

2014-08-31 08:28:06 [SEVERE] net.minecraft.util.ReportedException: Ticking tile entity
2014-08-31 08:28:06 [SEVERE] 	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:896)
2014-08-31 08:28:06 [SEVERE] 	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:331)
2014-08-31 08:28:06 [SEVERE] 	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784)
2014-08-31 08:28:06 [SEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:666)
2014-08-31 08:28:06 [SEVERE] 	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
2014-08-31 08:28:06 [SEVERE] Caused by: java.lang.NullPointerException
2014-08-31 08:28:06 [SEVERE] 	at thermalexpansion.util.Utils.isInventory(Utils.java:157)
2014-08-31 08:28:06 [SEVERE] 	at thermalexpansion.block.TileInventory.transferItem(TileInventory.java:33)
2014-08-31 08:28:06 [SEVERE] 	at thermalexpansion.block.machine.TilePulverizer.transferProducts(TilePulverizer.java:161)
2014-08-31 08:28:06 [SEVERE] 	at thermalexpansion.block.machine.TileMachineEnergized.func_70316_g(TileMachineEnergized.java:118)
2014-08-31 08:28:06 [SEVERE] 	at net.minecraft.world.World.func_72939_s(World.java:2752)
2014-08-31 08:28:06 [SEVERE] 	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:890)
2014-08-31 08:28:06 [SEVERE] 	... 4 more
2014-08-31 08:28:06 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.util.ReportedException: Ticking tile entity
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:896)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:331)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:666)
	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
Caused by: java.lang.NullPointerException
	at thermalexpansion.util.Utils.isInventory(Utils.java:157)
	at thermalexpansion.block.TileInventory.transferItem(TileInventory.java:33)
	at thermalexpansion.block.machine.TilePulverizer.transferProducts(TilePulverizer.java:161)
	at thermalexpansion.block.machine.TileMachineEnergized.func_70316_g(TileMachineEnergized.java:118)
	at net.minecraft.world.World.func_72939_s(World.java:2752)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:890)
	... 4 more

Edited August 31, 2014 by m1dude

[Kalbintion]

Issues belong on the tracker, link at top of page.

[Venema]

it's hard to dictate the problem and the cause when we dont know what mod pack, or what mods your using. my best guess is a corrupted chunk. Try to move the player to spawn, or jail them while they are offline so they dont crash the server when they join

[Kalbintion]

Venema, they already posted in the Tekkit section. To me that means they're running the Tekkit modpack. Also, these issues belong on the tracker and this user already posted on the Tekkit section there like they were supposed to. I don't suggest offering support on the forum posts since the staff here want issues posted to the tracker to begin with.