Fixed multiplayer crash

core/src/io/anuke/mindustry/content/Recipes.java

@@ -133,8 +133,6 @@ public class Recipes implements ContentList{
         new Recipe(units, UpgradeBlocks.deltaFactory, new ItemStack(Items.lead, 350), new ItemStack(Items.densealloy, 350), new ItemStack(Items.copper, 400), new ItemStack(Items.silicon, 450), new ItemStack(Items.thorium, 300));
         new Recipe(units, UpgradeBlocks.omegaFactory, new ItemStack(Items.lead, 450), new ItemStack(Items.densealloy, 550), new ItemStack(Items.silicon, 650), new ItemStack(Items.thorium, 600), new ItemStack(Items.surgealloy, 240));
 
-        //new Recipe(units, UpgradeBlocks.deltaFactory, new ItemStack(Items.copper, 30), new ItemStack(Items.lead, 50), new ItemStack(Items.silicon, 30));
-
         //actual unit related stuff
         new Recipe(units, UnitBlocks.dronePad, new ItemStack(Items.copper, 70), new ItemStack(Items.lead, 110), new ItemStack(Items.silicon, 130));
         new Recipe(units, UnitBlocks.fabricatorPad, new ItemStack(Items.densealloy, 90), new ItemStack(Items.thorium, 80), new ItemStack(Items.lead, 110), new ItemStack(Items.silicon, 210));

core/src/io/anuke/mindustry/core/ContentLoader.java

@@ -13,6 +13,7 @@ import io.anuke.mindustry.entities.bullet.Bullet;
 import io.anuke.mindustry.entities.bullet.BulletType;
 import io.anuke.mindustry.entities.effect.Fire;
 import io.anuke.mindustry.entities.effect.ItemDrop;
+import io.anuke.mindustry.entities.effect.Lightning;
 import io.anuke.mindustry.entities.effect.Puddle;
 import io.anuke.mindustry.entities.traits.TypeTrait;
 import io.anuke.mindustry.entities.units.UnitType;
@@ -170,5 +171,6 @@ public class ContentLoader{
         TypeTrait.registerType(Fire.class, Fire::new);
         TypeTrait.registerType(Puddle.class, Puddle::new);
         TypeTrait.registerType(Bullet.class, Bullet::new);
+        TypeTrait.registerType(Lightning.class, Lightning::new);
     }
 }

core/src/io/anuke/mindustry/entities/effect/Lightning.java

@@ -9,6 +9,7 @@ import io.anuke.annotations.Annotations.Loc;
 import io.anuke.annotations.Annotations.Remote;
 import io.anuke.mindustry.content.StatusEffects;
 import io.anuke.mindustry.entities.Units;
+import io.anuke.mindustry.entities.traits.SyncTrait;
 import io.anuke.mindustry.game.Team;
 import io.anuke.mindustry.gen.Call;
 import io.anuke.mindustry.graphics.Palette;
@@ -26,11 +27,15 @@ import io.anuke.ucore.util.Mathf;
 import io.anuke.ucore.util.Pooling;
 import io.anuke.ucore.util.SeedRandom;
 
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+
 import static io.anuke.mindustry.Vars.bulletGroup;
 import static io.anuke.mindustry.Vars.world;
 
 //TODO utterly broken
-public class Lightning extends TimedEntity implements Poolable, DrawTrait{
+public class Lightning extends TimedEntity implements Poolable, DrawTrait, SyncTrait{
     private static Array<SolidTrait> entities = new Array<>();
     private static Rectangle rect = new Rectangle();
     private static Rectangle hitrect = new Rectangle();
@@ -125,6 +130,21 @@ public class Lightning extends TimedEntity implements Poolable, DrawTrait{
         l.add();
     }
 
+    @Override
+    public boolean isSyncing(){
+        return false;
+    }
+
+    @Override
+    public void write(DataOutput data) throws IOException{
+
+    }
+
+    @Override
+    public void read(DataInput data, long time) throws IOException{
+
+    }
+
     @Override
     public float lifetime(){
         return 10;