Added a check to prevent playerdata from saving when it hasn't been fully loaded yet

src/main/java/net/Indyuce/mmocore/MMOCore.java

@@ -352,7 +352,7 @@ public class MMOCore extends JavaPlugin {
 			new BukkitRunnable() {
 				public void run() {
 					for (PlayerData loaded : PlayerData.getAll())
-						dataProvider.getDataManager().saveData(loaded);
+						if(loaded.isFullyLoaded()) dataProvider.getDataManager().saveData(loaded);
 
 					for (Guild guild : dataProvider.getGuildManager().getAll())
 						dataProvider.getGuildManager().save(guild);
@@ -363,6 +363,7 @@ public class MMOCore extends JavaPlugin {
 
 	public void onDisable() {
 		for (PlayerData data : PlayerData.getAll()) {
+			if(!data.isFullyLoaded()) return;
 			data.getQuestData().resetBossBar();
 			dataProvider.getDataManager().saveData(data);
 		}

src/main/java/net/Indyuce/mmocore/api/player/PlayerData.java

@@ -97,6 +97,8 @@ public class PlayerData extends OfflinePlayerData {
 	public boolean nocd;
 	public CombatRunnable combat;
 
+	private boolean fullyLoaded = false;
+
 	public PlayerData(MMOPlayerData mmoData) {
 		super(mmoData.getUniqueId());
 
@@ -577,6 +579,14 @@ public class PlayerData extends OfflinePlayerData {
 		stellium = Math.max(0, Math.min(amount, getStats().getStat(StatType.MAX_STELLIUM)));
 	}
 
+	public boolean isFullyLoaded() {
+		return fullyLoaded;
+	}
+
+	public void setFullyLoaded() {
+		this.fullyLoaded = true;
+	}
+
 	public boolean isCasting() {
 		return skillCasting != null;
 	}

src/main/java/net/Indyuce/mmocore/manager/data/mysql/MySQLPlayerDataManager.java

@@ -105,6 +105,7 @@ public class MySQLPlayerDataManager extends PlayerDataManager {
 									}
 								}
 							}
+							data.setFullyLoaded();
 						} catch (SQLException e) {
 							e.printStackTrace();
 						}
@@ -249,7 +250,7 @@ public class MySQLPlayerDataManager extends PlayerDataManager {
 
 	@Override
 	public void remove(PlayerData data) {
-		saveData(data);
+		if(data.isFullyLoaded()) saveData(data);
 		remove(data.getUniqueId());
 	}
 }

src/main/java/net/Indyuce/mmocore/manager/data/yaml/YAMLPlayerDataManager.java

@@ -67,6 +67,7 @@ public class YAMLPlayerDataManager extends PlayerDataManager {
 				} catch (IllegalArgumentException exception) {
 					MMOCore.log(Level.WARNING, "Could not load class info '" + key + "': " + exception.getMessage());
 				}
+		data.setFullyLoaded();
 	}
 
 	@Override