fix: crash on server

src/main/java/mffs/ClientProxy.java

@@ -4,6 +4,9 @@ import cpw.mods.fml.client.FMLClientHandler;
 import cpw.mods.fml.client.registry.ClientRegistry;
 import cpw.mods.fml.client.registry.ISimpleBlockRenderingHandler;
 import cpw.mods.fml.client.registry.RenderingRegistry;
+import cpw.mods.fml.relauncher.Side;
+import mffs.base.PacketFxs;
+import mffs.base.PacketFxsHandler;
 import mffs.gui.GuiBiometricIdentifier;
 import mffs.gui.GuiCoercionDeriver;
 import mffs.gui.GuiForceFieldProjector;
@@ -26,6 +29,7 @@ import mffs.tileentity.TileEntityForceFieldProjector;
 import mffs.tileentity.TileEntityForceManipulator;
 import mffs.tileentity.TileEntityFortronCapacitor;
 import mffs.tileentity.TileEntityInterdictionMatrix;
+import net.minecraft.client.Minecraft;
 import net.minecraft.client.particle.EntityFX;
 import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
 import net.minecraft.entity.player.EntityPlayer;
@@ -36,6 +40,14 @@ import net.minecraftforge.client.MinecraftForgeClient;
 import universalelectricity.core.vector.Vector3;
 
 public class ClientProxy extends CommonProxy {
+
+  @Override
+  public void preInit() {
+    ModularForceFieldSystem.channel.registerMessage(PacketFxsHandler.class, PacketFxs.class,
+      1, Side.CLIENT);
+      super.preInit();
+  }
+
   @Override
   public void init() {
     super.init();
@@ -128,4 +140,10 @@ public class ClientProxy extends CommonProxy {
     FMLClientHandler.instance().getClient().effectRenderer.addEffect((
         EntityFX) new FXHologramMoving(world, position, red, green, blue, age));
   }
+
+  @Override
+  public boolean isSneaking() {
+    EntityPlayer player = Minecraft.getMinecraft().thePlayer;
+    return player.isSneaking();
+  }
 }

src/main/java/mffs/CommonProxy.java

@@ -91,4 +91,8 @@ public class CommonProxy implements IGuiHandler {
   public void renderHologramMoving(final World world, final Vector3 position,
                                    final float red, final float green,
                                    final float blue, final int age) {}
+
+  public boolean isSneaking() {
+    return false;
+  }
 }

src/main/java/mffs/ModularForceFieldSystem.java

@@ -258,7 +258,6 @@ public class ModularForceFieldSystem {
                                     "tileInterdictionMatrix");
     GameRegistry.registerTileEntity(TileEntityForceManipulator.class,
                                     "tileForceManipulator");
-    ModularForceFieldSystem.proxy.preInit();
 
     FluidRegistry.registerFluid(FortronHelper.FLUID_FORTRON);
 
@@ -304,12 +303,9 @@ public class ModularForceFieldSystem {
 
     channel =
         NetworkRegistry.INSTANCE.newSimpleChannel("ModularForceFieldSystem");
-
+    ModularForceFieldSystem.proxy.preInit();
-    int pkgDiscriminator = 0;
     channel.registerMessage(PacketTileHandler.class, PacketTile.class,
-                            pkgDiscriminator++, Side.SERVER);
+                            0, Side.SERVER);
-    channel.registerMessage(PacketFxsHandler.class, PacketFxs.class,
-                            pkgDiscriminator++, Side.CLIENT);
   }
 
   @EventHandler

src/main/java/mffs/block/BlockForceField.java

@@ -116,8 +116,7 @@ public class BlockForceField
                                                        final int x, final int y,
                                                        final int z) {
     if (world.isRemote) {
-      EntityPlayer player = Minecraft.getMinecraft().thePlayer;
+      if (ModularForceFieldSystem.proxy.isSneaking()) {
-      if (player.isSneaking()) {
         return null;
       }
     }