SchematicSystem_Core/src/de/steamwar/schematicsystem/SchematicSystem.java

@@ -22,6 +22,8 @@ package de.steamwar.schematicsystem;
 import de.steamwar.message.Message;
 import de.steamwar.schematicsystem.commands.DownloadCommand;
 import de.steamwar.schematicsystem.commands.SchematicCommand;
+import de.steamwar.schematicsystem.listener.PlayerEventListener;
+import org.bukkit.Bukkit;
 import org.bukkit.plugin.java.JavaPlugin;
 
 public class SchematicSystem extends JavaPlugin {
@@ -35,6 +37,8 @@ public class SchematicSystem extends JavaPlugin {
 
         new SchematicCommand();
         new DownloadCommand();
+
+        Bukkit.getPluginManager().registerEvents(new PlayerEventListener(), this);
     }
 
     public static SchematicSystem getInstance() {

SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/SchematicCommandUtils.java

@@ -472,6 +472,11 @@ public class SchematicCommandUtils {
         inv.open();
     }
 
+    public static void quitPlayer(Player player) {
+        CACHED_LISTS.remove(player);
+        PUBLIC_TOGGLED.remove(player);
+    }
+
     @AllArgsConstructor
     @With
     static class CachedSchematicList {

SchematicSystem_Core/src/de/steamwar/schematicsystem/listener/PlayerEventListener.java

@@ -0,0 +1,14 @@
+package de.steamwar.schematicsystem.listener;
+
+import de.steamwar.schematicsystem.commands.SchematicCommandUtils;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerQuitEvent;
+
+public class PlayerEventListener implements Listener {
+
+    @EventHandler
+    public void onPlayerQuit(PlayerQuitEvent event) {
+        SchematicCommandUtils.quitPlayer(event.getPlayer());
+    }
+}