should fix small memory leak

api/src/main/java/us/ajg0702/queue/api/QueueManager.java

@@ -5,6 +5,8 @@ import us.ajg0702.queue.api.players.AdaptedPlayer;
 import us.ajg0702.queue.api.players.QueuePlayer;
 import us.ajg0702.queue.api.queues.QueueServer;
 
+import java.util.HashMap;
+
 public interface QueueManager {
 
     /**
@@ -123,4 +125,6 @@ public interface QueueManager {
     ImmutableList<QueueServer> getPlayerQueues(AdaptedPlayer p);
 
     void clear(AdaptedPlayer player);
+
+    HashMap<QueuePlayer, Integer> getSendingAttempts();
 }

common/src/main/java/us/ajg0702/queue/common/EventHandlerImpl.java

@@ -155,6 +155,7 @@ public class EventHandlerImpl implements EventHandler {
             if((pos <= 1 && server.getServerNames().contains(player.getServerName())) || main.getConfig().getBoolean("remove-player-on-server-switch")) {
                 server.removePlayer(player);
                 server.setLastSentTime(System.currentTimeMillis());
+                main.getQueueManager().getSendingAttempts().remove(queuePlayer);
             }
         }
 

common/src/main/java/us/ajg0702/queue/common/QueueManagerImpl.java

@@ -643,4 +643,9 @@ public class QueueManagerImpl implements QueueManager {
             sendingNowAntiSpam.remove(next);
         }
     }
+
+    @Override
+    public HashMap<QueuePlayer, Integer> getSendingAttempts() {
+        return sendingAttempts;
+    }
 }