diff --git a/lib/Modeler.js b/lib/Modeler.js
index 0343f79e..f0919238 100644
--- a/lib/Modeler.js
+++ b/lib/Modeler.js
@@ -108,6 +108,10 @@ function Modeler(options) {
       this._collectIds(event.definitions, event.context);
     }
   }, this);
+
+  this.on('diagram.destroy', function() {
+    this.moddle.ids.clear();
+  }, this);
 }
 
 inherits(Modeler, Viewer);