diff --git a/services/web/client/source/class/osparc/component/widget/NodesTree.js b/services/web/client/source/class/osparc/component/widget/NodesTree.js
index 96d1d128364..6a42d76c514 100644
--- a/services/web/client/source/class/osparc/component/widget/NodesTree.js
+++ b/services/web/client/source/class/osparc/component/widget/NodesTree.js
@@ -187,7 +187,9 @@ qx.Class.define("osparc.component.widget.NodesTree", {
             }, this);
             item.addListener("tap", e => {
               this.fireDataEvent("changeSelectedNode", item.getModel().getNodeId());
-              this.__exportButton.setEnabled((Boolean(item.getLevel()) && item.getModel().getIsContainer()));
+              if (this.__exportButton) {
+                this.__exportButton.setEnabled((Boolean(item.getLevel()) && item.getModel().getIsContainer()));
+              }
             }, this);
           }
         });