BauSystem_Main/src/de/steamwar/bausystem/world/RegionListener.java

@@ -117,8 +117,7 @@ public class RegionListener implements Listener {
         if(event.getAction() != Action.RIGHT_CLICK_BLOCK ||
                 !event.getClickedBlock().getType().name().contains("SIGN") ||
                 !event.getPlayer().isSneaking() ||
-                event.getItem() == null ||
-                event.getItem().getType() != Material.AIR)
+                (event.getItem() != null && event.getItem().getType() != Material.AIR))
             return;
 
         Player player = event.getPlayer();