diff --git a/static/js/utils.js b/static/js/utils.js
index e18560fe..66ef9f76 100644
--- a/static/js/utils.js
+++ b/static/js/utils.js
@@ -1047,6 +1047,9 @@ pandora.enableDragAndDrop = function($list, canMove, section, getItems) {
 };
 
 pandora.escapeQueryValue = function(value) {
+    if (!Ox.isString(value)) {
+        value = value.toString();
+    }
     return value.replace(/_/g, '%09')
         .replace(/\s/g, '_')
         .replace(/</g, '%0E')