Final fixes

SpigotCore/SpigotCore_20/src/de/steamwar/core/WorldEditRendererWrapper20.java

@@ -82,7 +82,8 @@ public class WorldEditRendererWrapper20 implements WorldEditRendererWrapper {
         float width = type.getWidth(player).value;
         Material material = type.getMaterial(player);
         if (material == Material.BARRIER) {
-            hide(player, null, clipboard, true);
+            hide(player, owner, clipboard, true);
+            return;
         }
         BlockData block = material.createBlockData();
 

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

@@ -89,7 +89,7 @@ public class WorldEditRendererCUIEditor {
     }
 
     public WorldEditRendererCUIEditor() {
-        if (Core.getVersion() >= 21) {
+        if (Core.getVersion() >= 20) {
             new Command();
         }
     }