Close server socket before world saving

SpigotCore/SpigotCore_Main/src/de/steamwar/core/CheckpointUtilsJ9.java

@@ -94,8 +94,6 @@ class CheckpointUtilsJ9 {
     private static final Reflection.Method bind = Reflection.getMethod(TinyProtocol.serverConnection, null, InetAddress.class, int.class);
     private static void freezeInternal(Path path) throws Exception {
         Bukkit.getPluginManager().callEvent(new CRIUSleepEvent());
-        Bukkit.getWorlds().forEach(FlatteningWrapper.impl::syncSave);
-        Statement.closeAll();
 
         // Close socket
         Object serverConnection = TinyProtocol.getServerConnection(Core.getInstance());
@@ -105,6 +103,9 @@ class CheckpointUtilsJ9 {
         }
         channels.clear();
 
+        Bukkit.getWorlds().forEach(FlatteningWrapper.impl::syncSave);
+        Statement.closeAll();
+
         System.runFinalization();
         System.gc();