Fix npe causes by null entry in render queue???

schematicbrushreborn-core/src/main/java/de/eldoria/schematicbrush/rendering/PacketWorker.java

@@ -12,6 +12,8 @@
 import org.bukkit.entity.Player;
 
 import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Objects;
 import java.util.Queue;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -95,7 +97,7 @@ public void process(Player player) {
     public int packetQueueCount() {
         // We copy the queue to avoid modification during counting.
         // Synchronizing the queue would stop the worker from working properly
-        return new ArrayDeque<>(queue).stream().mapToInt(RenderSink::size).sum();
+        return new ArrayList<>(queue).stream().filter(Objects::nonNull).mapToInt(RenderSink::size).sum();
     }
 
     public int size() {