diff --git a/lib/Alchemy/Phrasea/Controller/Prod/ToolsController.php b/lib/Alchemy/Phrasea/Controller/Prod/ToolsController.php
index 3b88e81237..fa3fbac84a 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/ToolsController.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/ToolsController.php
@@ -41,7 +41,7 @@ class ToolsController extends Controller
         $metadatas = false;
         $record = null;
         $recordAccessibleSubdefs = array();
-
+        $listsubdef= null;
         if (count($records) == 1) {
             /** @var \record_adapter $record */
             $record = $records->first();
diff --git a/templates/web/prod/actions/Tools/index.html.twig b/templates/web/prod/actions/Tools/index.html.twig
index aed57ce82f..60bee62d2d 100644
--- a/templates/web/prod/actions/Tools/index.html.twig
+++ b/templates/web/prod/actions/Tools/index.html.twig
@@ -197,9 +197,11 @@
             <div class="metadatas-top-block">
                 <select id="select-meta-subdef" name="metaSubdef" class="input-medium check-filters">
                     <option value="" disabled >{{"prod::tool:select subdef" | trans}}</option>
-                    {% for subdef in listsubdef %}
-                    <option value= "{{ subdef }}" {{ subdef== 'document'? 'selected' : 'false' }}>{{ subdef }}</option>
-                    {% endfor %}
+                    {% if listsubdef is defined and listsubdef is not null %}
+                        {% for subdef in listsubdef %}
+                        <option value= "{{ subdef }}" {{ subdef== 'document'? 'selected' : 'false' }}>{{ subdef }}</option>
+                        {% endfor %}
+                    {% endif %}
                 </select>
             </div>
             <div id="metadata-load" style="height: 100%"></div>