diff --git a/piwik/indico_piwik/static/js/statistics.js b/piwik/indico_piwik/static/js/statistics.js
index 88dd176..c3c0d2b 100644
--- a/piwik/indico_piwik/static/js/statistics.js
+++ b/piwik/indico_piwik/static/js/statistics.js
@@ -155,17 +155,18 @@ $(function() {
     var load_material_tree = function() {
         $(treeDOMTarget).html(progressIndicator(true, true).dom);
 
-        indicoRequest('piwik.getMaterialTreeData',
-        {
-            confId: $('#confId').val()
-        },
-        function(result, error) {
-            if (!error) {
-                if (result !== null) {
-                    draw_jqTree(result);
+        $.ajax({
+            url: build_url(PiwikPlugin.urls.material, {confId: $('#confId').val()}),
+            type: 'POST',
+            dataType: 'json',
+            success: function(data) {
+                if (handleAjaxError(data)) {
+                    return;
+                }
+                if (data.material.tree !== null) {
+                    draw_jqTree(data.material.tree);
                 } else {
-                    /* There is no material present */
-                    $(treeDOMTarget).html($T('No Material Found.'));
+                    $(treeDOMTarget).html($T('No material found'));
                 }
             }
         });
diff --git a/piwik/indico_piwik/templates/statistics.html b/piwik/indico_piwik/templates/statistics.html
index 6f4b42c..fc7c0a6 100644
--- a/piwik/indico_piwik/templates/statistics.html
+++ b/piwik/indico_piwik/templates/statistics.html
@@ -195,13 +195,13 @@
                     <div id="materialHeader" class="statsTableDivider">
                         {% trans %}Downloads for{% endtrans %}:
                         <span id="materialTitle">
-                            {% trans %}No Material Selected{% endtrans %}.
+                            &mdash;
                         </span>
                         ({% trans %}Total{% endtrans %}: <span id="materialTotalDownloads">0</span>)
                     </div>
                     <div id="materialInfo">
                         <div id='materialDownloadChart'>
-                            {% trans %}No Material Selected{% endtrans %}.
+                            {% trans %}No material selected{% endtrans %}
                         </div>
                     </div>
                 </div>