Fix REntityServer NPE

SpigotCore_Main/src/de/steamwar/entity/REntityServer.java

@@ -30,8 +30,10 @@ import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerMoveEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
 
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Set;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
 
@@ -42,7 +44,7 @@ public class REntityServer implements Listener {
     private static final HashSet<Player> emptyPlayers = new HashSet<>(0);
 
     private final HashMap<Long, HashSet<REntity>> entities = new HashMap<>();
-    private final HashMap<Long, HashSet<Player>> players = new HashMap<>();
+    private final HashMap<Long, Set<Player>> players = new HashMap<>();
     private final HashMap<Player, Location> lastLocation = new HashMap<>();
 
     public REntityServer() {
@@ -145,7 +147,7 @@ public class REntityServer implements Listener {
         forChunkInView(player, location, (x, z) -> players.get(chunkToId(x, z)).remove(player));
     }
 
-    private void onMissing(HashSet<Player> of, HashSet<Player> in, Consumer<Consumer<Object>> packetProvider) {
+    private void onMissing(Set<Player> of, Set<Player> in, Consumer<Consumer<Object>> packetProvider) {
         if(of == null)
             return;
 
@@ -178,7 +180,7 @@ public class REntityServer implements Listener {
 
     private void removePlayerFromChunk(Player player, int x, int z) {
         long id = chunkToId(x, z);
-        players.get(id).remove(player);
+        players.getOrDefault(id, Collections.emptySet()).remove(player);
         for(REntity entity : entities.getOrDefault(id, emptyEntities)) {
             entity.despawn(packet -> TinyProtocol.instance.sendPacket(player, packet));
         }