diff --git a/src/MinecraftServerInterface.java b/src/MinecraftServerInterface.java
index 363765e11..2f4b2f49a 100644
--- a/src/MinecraftServerInterface.java
+++ b/src/MinecraftServerInterface.java
@@ -60,11 +60,29 @@ public class MinecraftServerInterface {
         }
         proxy.setEditSession(editSession);
 
-        bj treeGen = new he();
+        bt treeGen = new ib();
         return treeGen.a(proxy, random,
                 pt.getBlockX(), pt.getBlockY(), pt.getBlockZ());
     }
 
+    /**
+     * Get mob spawner mob type. May return an empty string.
+     *
+     * @param pt
+     * @param mobType
+     */
+    public static String getMobSpawnerType(Vector pt) {
+        bg o = etc.getMCServer().e.l(
+                pt.getBlockX(), pt.getBlockY(), pt.getBlockZ());
+        
+        if (o != null && o instanceof cq) {
+            String type = ((cq)o).f;
+            return type != null ? type : "";
+        }
+
+        return "";
+    }
+
     /**
      * Instantiate a class without calling its constructor.
      *
diff --git a/src/MinecraftSetBlockProxy.java b/src/MinecraftSetBlockProxy.java
index 4476c2a38..96c91cca1 100644
--- a/src/MinecraftSetBlockProxy.java
+++ b/src/MinecraftSetBlockProxy.java
@@ -26,7 +26,7 @@ import com.sk89q.worldedit.blocks.BaseBlock;
  *
  * @author sk89q
  */
-public class MinecraftSetBlockProxy extends eq {
+public class MinecraftSetBlockProxy extends ff {
     /**
      * Edit session.
      */
diff --git a/src/ServerInterface.java b/src/ServerInterface.java
index 8bd81e7ed..cae88f2dc 100644
--- a/src/ServerInterface.java
+++ b/src/ServerInterface.java
@@ -233,15 +233,13 @@ public class ServerInterface {
      * @param mobType
      */
     public static String getMobSpawnerType(Vector pt) {
-        ay o = etc.getMCServer().e.k(
-                pt.getBlockX(), pt.getBlockY(), pt.getBlockZ());
-        
-        if (o != null && o instanceof cf) {
-            String type = ((cf)o).f;
-            return type != null ? type : "";
+        try {
+            return MinecraftServerInterface.getMobSpawnerType(pt);
+        } catch (Throwable t) {
+            logger.severe("Failed to get mob spawner type (do you need to update WorldEdit due to a Minecraft update?): "
+                    + t.getMessage());
+            return "";
         }
-
-        return "";
     }
 
     /**