Server logs spammed with NPEs

[kadamgreene]

I have a server running:

Minecraft 1.7.10 (FTB Infinity 1.7.0)
Buildcraft 7.0.12

And I keep getting this error spammed to the console:

09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: java.lang.NullPointerException
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.world.World.func_72939_s(World.java:1887)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.world.World.func_72870_g(World.java:2034)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.world.World.func_72866_a(World.java:2070)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1561)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at net.minecraft.entity.Entity.func_70071_h_(Entity.java:318)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at buildcraft.robotics.EntityRobot.func_70030_z(EntityRobot.java:349)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at buildcraft.api.robots.AIRobot.cycle(AIRobot.java:126)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at buildcraft.robotics.ai.AIRobotMain.preempt(AIRobotMain.java:45)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at buildcraft.api.robots.AIRobot.startDelegateAI(AIRobot.java:144)
09.07 07:53:05 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: at buildcraft.robotics.ai.AIRobotGoAndLinkToDock.start(AIRobotGoAndLinkToDock.java:34)

The server doesn't crash, just spams. All I have in game is a golden BC power pipe with a robot docking station on it with a harvester robot on it, an emerald chipset telling the robot to return to station on redstone signal and to harvest area when redstone is off. I have a lever turned on to provide redstone signal.