Fixed multiplayer crash

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;