diff --git a/resources/config.yml b/resources/config.yml
index 7a4d2cf..2842a9a 100644
--- a/resources/config.yml
+++ b/resources/config.yml
@@ -17,7 +17,9 @@ BackpackTitle: "&bBackpack"
 # Defines if the content of the backpack get dropped on the death of a player.
 # If enabled, it can be disabled for individual players with the "backpack.KeepOnDeath" permission.
 DropOnDeath: true
-# Defines the max amount of columns for a backpack
+# Defines the max amount of columns for a backpack.
+# The size of the user's backpack will be defined by the permission, permissions for bigger backpacks than this value will be ignored.
+# Can be set to anything > 0. Backpacks with more than 6 columns will have a broken UI! Sizes bigger than 9 may not work with all permission plugins.
 MaxSize: 6
 # Defines in which game-modes a player can access his backpack (name or id)
 # Options: ADVENTURE, CREATIVE, SPECTATOR, SURVIVAL
@@ -127,6 +129,19 @@ ItemFilter:
   # List off items not allowed in the backpack. Can be name or id.
   Blacklist: []
 
+# This settings allow control over how the plugin behave in different worlds
+WorldSettings:
+  # All worlds listed here will not have the plugin usable
+  # Blacklist: ["creative_world"]
+  # Blacklist: ["creative_world1", "creative_world2"]
+  Blacklist: []
+  # Defines how the Blacklist will be enforced
+  # Options:
+  #   Message           = The player will see an message that the usage of the backpack is denied in this world.
+  #   MissingPermission = The player will receive the plugins no permission message.
+  #   NoPlugin          = The plugin will not be available at all and act as if it was not installed. This also exclude players with permission to bypass the world restriction from using it!
+  BlacklistMode: "Message"
+
 Misc:
   # Enables/Disables the auto-update function of the plugin.
   AutoUpdate: true
diff --git a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Config.java b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Config.java
index 72a7726..c9b6ab8 100644
--- a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Config.java
+++ b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Config.java
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2016-2017 GeorgH93
+ *   Copyright (C) 2016-2018 GeorgH93
  *
  *   This program is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -19,7 +19,9 @@
 
 import at.pcgamingfreaks.Bukkit.Configuration;
 import at.pcgamingfreaks.Bukkit.MinecraftMaterial;
+import at.pcgamingfreaks.ConsoleColor;
 import at.pcgamingfreaks.Minepacks.Bukkit.Database.Helper.OldFileUpdater;
+import at.pcgamingfreaks.Minepacks.Bukkit.Database.Helper.WorldBlacklistMode;
 
 import org.bukkit.ChatColor;
 import org.bukkit.GameMode;
@@ -280,7 +282,7 @@ public boolean isItemFilterEnabled()
 
 	public Collection<MinecraftMaterial> getItemFilterBlacklist()
 	{
-		List<String> stringBlacklist = config.getStringList("ItemFilter.Blacklist", new LinkedList<String>());
+		List<String> stringBlacklist = config.getStringList("ItemFilter.Blacklist", new LinkedList<>());
 		Collection<MinecraftMaterial> blacklist = new LinkedList<>();
 		for(String item : stringBlacklist)
 		{
@@ -290,5 +292,27 @@ public Collection<MinecraftMaterial> getItemFilterBlacklist()
 		return blacklist;
 	}
 	//endregion
+
+	//region World settings
+	public Collection<String> getWorldBlacklist()
+	{
+		return new HashSet<>(config.getStringList("WorldSettings.Blacklist", new LinkedList<>()));
+	}
+
+	public WorldBlacklistMode getWorldBlacklistMode()
+	{
+		String mode = config.getString("WorldSettings.BlacklistMode", "Message");
+		WorldBlacklistMode blacklistMode = WorldBlacklistMode.Message;
+		try
+		{
+			blacklistMode = WorldBlacklistMode.valueOf(mode);
+		}
+		catch(IllegalArgumentException ignored)
+		{
+			logger.warning(ConsoleColor.YELLOW + "Unsupported mode \"" + mode + "\" for option \"WorldSettings.BlacklistMode\"" + ConsoleColor.RESET);
+		}
+		return blacklistMode;
+	}
+	//endregion
 	//endregion
 }
\ No newline at end of file
diff --git a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Helper/WorldBlacklistMode.java b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Helper/WorldBlacklistMode.java
new file mode 100644
index 0000000..d74c50a
--- /dev/null
+++ b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Helper/WorldBlacklistMode.java
@@ -0,0 +1,23 @@
+/*
+ *   Copyright (C) 2018 GeorgH93
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package at.pcgamingfreaks.Minepacks.Bukkit.Database.Helper;
+
+public enum WorldBlacklistMode
+{
+	Message, MissingPermission, NoPlugin
+}
\ No newline at end of file
diff --git a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/InventorySerializer.java b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/InventorySerializer.java
index e676fff..44e6a18 100644
--- a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/InventorySerializer.java
+++ b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/InventorySerializer.java
@@ -37,7 +37,7 @@ public InventorySerializer()
 		String[] version = name.substring(name.lastIndexOf('.') + 2).split("_");
 		try
 		{
-			if(version[0].equals("1") && Integer.parseInt(version[1]) > 7)
+			if(NBTItemStackSerializer.isMCVersionCompatible())
 			{
 				serializer = new NBTItemStackSerializer();
 			}
diff --git a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQL.java b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQL.java
index de49d08..93a7f98 100644
--- a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQL.java
+++ b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQL.java
@@ -213,7 +213,7 @@ protected final void buildQuerys()
 			queryGetBP += "{FieldName}=?;";
 			querySyncCooldown = "INSERT INTO {TableCooldowns} ({FieldCDPlayer},{FieldCDTime}) SELECT {FieldPlayerID},? FROM {TablePlayers} WHERE {FieldName}=?;";
 		}
-		queryInsertBp = "INSERT INTO {TableBackpacks} ({FieldBPOwner},{FieldBPITS},{FieldBPVersion}) VALUES (?,?,?);";
+		queryInsertBp = "REPLACE INTO {TableBackpacks} ({FieldBPOwner},{FieldBPITS},{FieldBPVersion}) VALUES (?,?,?);";
 		queryUpdateBp = "UPDATE {TableBackpacks} SET {FieldBPITS}=?,{FieldBPVersion}=?,{FieldBPLastUpdate}={NOW} WHERE {FieldBPOwner}=?;";
 		queryDeleteOldBackpacks = "DELETE FROM {TableBackpacks} WHERE {FieldBPLastUpdate} < DATE('now', '-{VarMaxAge} days')";
 		if(useUUIDSeparators)
diff --git a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQLite.java b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQLite.java
index 22a684f..4319d87 100644
--- a/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQLite.java
+++ b/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQLite.java
@@ -89,7 +89,7 @@ protected void updateQuerysForDialect()
 			queryInsertBp = queryInsertBp.replaceAll("\\) VALUES \\(\\?,\\?,\\?", "{FieldBPLastUpdate}) VALUES (?,?,?,DATE('now')");
 		}
 		queryDeleteOldBackpacks = "DELETE FROM {TableBackpacks} WHERE {FieldBPLastUpdate} < DATE('now', '-{VarMaxAge} days')";
-		queryUpdateBp = queryUpdateBp.replaceAll("\\{NOW\\}", "DATE('now')");
+		queryUpdateBp = queryUpdateBp.replaceAll("\\{NOW}", "DATE('now')");
 		if(useUUIDs)
 		{
 			queryUpdatePlayerAdd = "INSERT OR IGNORE INTO {TablePlayers} ({FieldName},{FieldUUID}) VALUES (?,?);";