Kinetic.Node.moveTo() now checks if the node is already a child of the target container before removing it from the current container and adding it to the target container.

src/Node.js

@@ -1031,8 +1031,10 @@
          * node.moveTo(layer2);
          */
         moveTo: function(newContainer) {
-            Kinetic.Node.prototype.remove.call(this);
-            newContainer.add(this);
+            if (this.getParent() !== newContainer) {
+                this.remove();
+                newContainer.add(this);
+            }
             return this;
         },
         /**