2.0.1: Do not close entities on non-primary threads (#9)

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>de.kcodeyt</groupId>
     <artifactId>Heads</artifactId>
-    <version>2.0.0</version>
+    <version>2.0.1</version>
 
     <properties>
         <maven.compiler.source>1.8</maven.compiler.source>

src/main/java/de/kcodeyt/heads/blockentity/BlockEntitySkull.java

@@ -87,6 +87,11 @@ public int getSkullType() {
 
     @Override
     public void close() {
+        if(!this.server.isPrimaryThread()) {
+            this.server.getScheduler().scheduleTask(null, this::close);
+            return;
+        }
+
         if(this.entitySkull != null) this.entitySkull.close();
         super.close();
     }

src/main/java/de/kcodeyt/heads/entity/EntitySkull.java

@@ -110,6 +110,16 @@ public void despawnFrom(Player player) {
         SpawnProvider.despawnFrom(player, this);
     }
 
+    @Override
+    public void close() {
+        if(!this.server.isPrimaryThread()) {
+            this.server.getScheduler().scheduleTask(null, this::close);
+            return;
+        }
+
+        super.close();
+    }
+
     @Override
     public void saveNBT() {
         this.namedTag = EMPTY_COMPOUND;

src/main/java/de/kcodeyt/heads/provider/SpawnProvider.java

@@ -64,6 +64,7 @@ public static void tick(Server server) {
             if(allSkulls.isEmpty()) continue;
 
             final List<EntitySkull> sortedSkulls = new ArrayList<>(allSkulls);
+            sortedSkulls.removeIf(Objects::isNull);
             sortedSkulls.sort(Comparator.comparingDouble(e -> e.distanceSquared(player)));
 
             final int maxSkulls = Math.min(50, sortedSkulls.size());

src/main/resources/plugin.yml

@@ -1,4 +1,4 @@
 name: Heads
-version: "2.0.0"
+version: "2.0.1"
 api: [ "1.0.0" ]
 main: de.kcodeyt.heads.Heads