Invert condition

SpigotCore_Main/src/de/steamwar/core/CheckpointUtils.java

@@ -60,7 +60,12 @@ public class CheckpointUtils {
         Bukkit.getOnlinePlayers().forEach(player -> player.kickPlayer(null));
 
         List<?> networkManagers = TinyProtocol.networkManagers.get(TinyProtocol.getServerConnection(Core.getInstance()));
-        if(networkManagers.isEmpty()) {
+        if(!networkManagers.isEmpty()) {
+            Core.getInstance().getLogger().log(Level.INFO, "Waiting for players to disconnect for checkpointing");
+            Bukkit.getScheduler().runTaskLater(Core.getInstance(), CheckpointUtils::freeze, 1);
+            return;
+        }
+
         Path path = FileSystems.getDefault().getPath(checkpointFile);
 
         try {
@@ -76,11 +81,6 @@ public class CheckpointUtils {
                 //ignore
             }
         }
-            return;
-        }
-
-        Core.getInstance().getLogger().log(Level.INFO, "Waiting for players to disconnect for checkpointing");
-        Bukkit.getScheduler().runTaskLater(Core.getInstance(), CheckpointUtils::freeze, 1);
     }
 
     private static final Reflection.FieldAccessor<List> channelFutures = Reflection.getField(TinyProtocol.serverConnection, List.class, 0, ChannelFuture.class);