Fix Memory Leak

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

@@ -197,11 +197,18 @@ public class REntityServer implements Listener {
     @EventHandler
     public void onQuit(PlayerQuitEvent e) {
         Player player = e.getPlayer();
+        viewDistance.remove(player);
         Location location = lastLocation.remove(player);
         if(location == null)
             return;
 
-        forChunkInView(player, location, (x, z) -> players.get(chunkToId(x, z)).remove(player));
+        forChunkInView(player, location, (x, z) -> {
+            long id = chunkToId(x, z);
+            Set<Player> playersInChunk = players.get(id);
+            playersInChunk.remove(player);
+            if(playersInChunk.isEmpty())
+                players.remove(id);
+        });
     }
 
     private void onMissing(Set<Player> of, Set<Player> in, Consumer<Consumer<Object>> packetProvider) {
@@ -237,7 +244,12 @@ public class REntityServer implements Listener {
 
     private void removePlayerFromChunk(Player player, int x, int z) {
         long id = chunkToId(x, z);
-        players.get(id).remove(player);
+
+        Set<Player> playersInChunk = players.get(id);
+        playersInChunk.remove(player);
+        if(playersInChunk.isEmpty())
+            players.remove(id);
+
         for(REntity entity : entities.getOrDefault(id, emptyEntities)) {
             entity.despawn(packet -> TinyProtocol.instance.sendPacket(player, packet));
         }