diff --git a/templates/pages/backoffice/ajaxpage/layout.html.twig b/templates/pages/backoffice/ajaxpage/layout.html.twig
index 10f0f6fbb..cf207d773 100644
--- a/templates/pages/backoffice/ajaxpage/layout.html.twig
+++ b/templates/pages/backoffice/ajaxpage/layout.html.twig
@@ -186,25 +186,27 @@
     {% endif %}
 
     {% block iboPageCssFiles %}
-        <script type="text/javascript">
-            // If this constant isn't defined by the main page, define it (global) ourselves
-            if (typeof aLoadedCssFilesRegister === "undefined") {
-                Object.defineProperty(window, "aLoadedCssFilesRegister", {
-                    value: new Map(),
-                    writable: false,
-                    configurable: false,
-                    enumerable: true
-                });
-            }
-
-            {% for aCssFileData in aPage.aCssFiles %}
-                // Only if file is NOT already present in the register (see it declaration in WebPage TWIG template), add it to the page and register
-                if (aLoadedCssFilesRegister.has("{{ aCssFileData['link']|raw }}") === false) {
-                    $('<link href="{{ aCssFileData['link'] }}" rel="stylesheet">').appendTo('head');
-                    aLoadedCssFilesRegister.set("{{ aCssFileData['link']|raw }}", true);
+        {% if aPage.aCssFiles is not empty %}
+            <script type="text/javascript">
+                // If this constant isn't defined by the main page, define it (global) ourselves
+                if (typeof aLoadedCssFilesRegister === "undefined") {
+                    Object.defineProperty(window, "aLoadedCssFilesRegister", {
+                        value: new Map(),
+                        writable: false,
+                        configurable: false,
+                        enumerable: true
+                    });
                 }
-            {% endfor %}
-        </script>
+
+                {% for aCssFileData in aPage.aCssFiles %}
+                    // Only if file is NOT already present in the register (see it declaration in WebPage TWIG template), add it to the page and register
+                    if (aLoadedCssFilesRegister.has("{{ aCssFileData['link']|raw }}") === false) {
+                        $('<link href="{{ aCssFileData['link'] }}" rel="stylesheet">').appendTo('head');
+                        aLoadedCssFilesRegister.set("{{ aCssFileData['link']|raw }}", true);
+                    }
+                {% endfor %}
+            </script>
+        {% endif %}
     {% endblock %}
 
     {{ aPage.sCapturedOutput|raw }}