So pretty much love this mod...however at random times we start getting the below

Description: Ticking block entity

java.lang.NullPointerException: Ticking block entity
at com.nekokittygames.mffs.common.tileentity.TileEntityProjector.FieldGenerate(TileEntityProjector.java:724)
at com.nekokittygames.mffs.common.tileentity.TileEntityProjector.func_73660_a(TileEntityProjector.java:497)
at org.spongepowered.common.event.tracking.TrackingUtil.tickTileEntity(TrackingUtil.java:220)
at net.minecraft.world.WorldServer.updateTileEntity(WorldServer.java:2798)
at net.minecraft.world.WorldServer.redirect$onUpdateTileEntities$zjn000(WorldServer.java:2785)
at net.minecraft.world.World.func_72939_s(World.java:5999)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:2153)
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)

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

-- Head --
Thread: Server thread
Stacktrace:
at com.nekokittygames.mffs.common.tileentity.TileEntityProjector.FieldGenerate(TileEntityProjector.java:724)
at com.nekokittygames.mffs.common.tileentity.TileEntityProjector.func_73660_a(TileEntityProjector.java:497)
at org.spongepowered.common.event.tracking.TrackingUtil.tickTileEntity(TrackingUtil.java:220)
at net.minecraft.world.WorldServer.updateTileEntity(WorldServer.java:2798)
at net.minecraft.world.WorldServer.redirect$onUpdateTileEntities$zjn000(WorldServer.java:2785)

-- Block entity being ticked --
Details:
Name: MFFSProjector // com.nekokittygames.mffs.common.tileentity.TileEntityProjector
Block type: ID #284 (tile.modularforcefieldsystem.projector // com.nekokittygames.mffs.common.block.BlockProjector)
Block data value: 4 / 0x4 / 0b0100
Block location: World: (476,4,-1248), Chunk: (at 12,0,0 in 29,-78; contains blocks 464,0,-1248 to 479,255,-1233), Region: (0,-3; contains chunks 0,-96 to 31,-65, blocks 0,0,-1536 to 511,255,-1025)
Actual block type: ID #284 (tile.modularforcefieldsystem.projector // com.nekokittygames.mffs.common.block.BlockProjector)
Actual block data value: 4 / 0x4 / 0b0100
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:5999)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:2153)

-- Affected level --
Details:
Level name: world
All players: 2 total; [EntityPlayerMP['Cleardragonf'/208, l='world', x=474.00, y=4.00, z=-1248.45], EntityPlayerMP['DarkGear353'/219, l='world', x=473.53, y=4.00, z=-1244.80]]
Chunk stats: ServerChunkCache: 526 Drop: 0
Level seed: 7021631124827391688
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (372,4,-1223), Chunk: (at 4,0,9 in 23,-77; contains blocks 368,0,-1232 to 383,255,-1217), Region: (0,-3; contains chunks 0,-96 to 31,-65, blocks 0,0,-1536 to 511,255,-1025)
Level time: 95943 game time, 95943 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 72482 (now: false), thunder time: 128662 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
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)