diff --git a/panels_ipe/js/views/CategoryView.js b/panels_ipe/js/views/CategoryView.js
index 24d764c..bc6fd88 100644
--- a/panels_ipe/js/views/CategoryView.js
+++ b/panels_ipe/js/views/CategoryView.js
@@ -256,7 +256,7 @@

       // Filter our collection based on the input.
       var results = this.collection.filter(function (model) {
-        var attribute = model.get(this.searchAttribute);
+        var attribute = model.get(this.searchAttribute) || '';
         return attribute.toLowerCase().indexOf(search) !== -1;
       }, this);