diff --git a/Resources/views/Default/failed_list.html.twig b/Resources/views/Default/failed_list.html.twig
index b3222e9..63ce3f3 100644
--- a/Resources/views/Default/failed_list.html.twig
+++ b/Resources/views/Default/failed_list.html.twig
@@ -12,6 +12,7 @@
                     <th>Failed at</th>
                     <th>Job</th>
                     <th>Error</th>
+                    <th>Backtrace</th>
                 </tr>
             </thead>
             <tbody>
@@ -24,10 +25,13 @@
                         {{ job.exceptionClass }}<br>
                         {{ job.error }}
                     </td>
+                    <td class="span5">
+                        <pre>{{ job.backtrace |json_encode() }}</pre><br>
+                    </td>
                 </tr>
                 {% else %}
                 <tr>
-                    <td colspan="4">
+                    <td colspan="5">
                         <em>empty...</em>
                     </td>
                 </tr>
diff --git a/Resources/views/Default/index.html.twig b/Resources/views/Default/index.html.twig
index 5ac8b69..71d1446 100644
--- a/Resources/views/Default/index.html.twig
+++ b/Resources/views/Default/index.html.twig
@@ -85,7 +85,7 @@
                                         {% for argname, argvalue in job.args %}
                                             <li>
                                                 <span>{{ argname }}</span>
-                                                <em class="pull-right">{{ argvalue | json_encode(constant('JSON_PRETTY_PRINT')) }}</em>
+                                                <em class="pull-right">{{ argvalue | json_encode() }}</em>
                                             </li>
                                         {% endfor %}
                                     </ul>