diff --git a/src/main/java/net/walterhiggins/scriptcraft/ScriptCraftPlugin.java b/src/main/java/net/walterhiggins/scriptcraft/ScriptCraftPlugin.java
index 385602c..16ee538 100644
--- a/src/main/java/net/walterhiggins/scriptcraft/ScriptCraftPlugin.java
+++ b/src/main/java/net/walterhiggins/scriptcraft/ScriptCraftPlugin.java
@@ -15,8 +15,9 @@ import java.util.ArrayList;
 import org.bukkit.plugin.java.JavaPlugin;
 import org.bukkit.command.*;
 import org.bukkit.Bukkit;
+import org.bukkit.event.Listener;
 
-public class ScriptCraftPlugin extends JavaPlugin
+public class ScriptCraftPlugin extends JavaPlugin implements Listener
 {
     // right now all ops share the same JS context/scope
     // need to look at possibly having context/scope per operator
diff --git a/src/main/javascript/events/events.js b/src/main/javascript/events/events.js
index 242a2c6..eadbb82 100644
--- a/src/main/javascript/events/events.js
+++ b/src/main/javascript/events/events.js
@@ -94,10 +94,6 @@ var events = events || {
     }
     var _event = org.bukkit.event;
     var _plugin = org.bukkit.plugin;
-    // 
-    // can't have objects that implement multiple interface in javax.scripts.* 
-    //
-    var theListener = new _event.Listener(){};
 
     var _on = function(eventType, handler, priority)
     {
@@ -121,7 +117,19 @@ var events = events || {
             } 
         };
         listener.reg = new _plugin.RegisteredListener(
-            theListener,eventExecutor,priority,__plugin,true
+            /* 
+               wph 20130222 issue #64 bad interaction with Essentials plugin
+               if another plugin tries to unregister a Listener (not a Plugin or a RegisteredListener)
+               then BOOM! the other plugin will throw an error because Rhino can't coerce an
+               equals() method from an Interface.
+               The workaround is to make the ScriptCraftPlugin java class a Listener.
+               Should only unregister() registered plugins in ScriptCraft js code.
+            */
+            __plugin
+            ,eventExecutor
+            ,priority
+            ,__plugin
+            ,true
         )
         handlerList.register(listener.reg);
         return listener.reg;
diff --git a/src/main/javascript/signs/menu.js b/src/main/javascript/signs/menu.js
index 605e7de..d45adca 100644
--- a/src/main/javascript/signs/menu.js
+++ b/src/main/javascript/signs/menu.js
@@ -206,6 +206,7 @@ var signs = signs || plugin("signs", {
               look up our list of menu signs. If there's a matching location and there's
               a sign, then update it.
             */
+
             if (! event.clickedBlock.state instanceof org.bukkit.block.Sign)
                 return;
             var evtLocStr = utils.locationToString(event.clickedBlock.location);
@@ -213,7 +214,6 @@ var signs = signs || plugin("signs", {
             if (signUpdater)
                 signUpdater(event.player, event.clickedBlock.state);
         });
-        
     });
 }());