diff --git a/pygeoapi/templates/collections/items/index.html b/pygeoapi/templates/collections/items/index.html
index 635bce4..746cc5e 100644
--- a/pygeoapi/templates/collections/items/index.html
+++ b/pygeoapi/templates/collections/items/index.html
@@ -88,13 +88,13 @@
           <tbody>
             {% for ft in data['features'] %}
               <tr>
-                <td data-label="id"><a href="{{ data['items_path']}}/{{ ft.id }}" title="{{ ft.id }}">{{ ft.id | truncate( 12 )  }}</a></td>
+                <td data-label="id"><a href="{{ data['items_path']}}/{{ ft.id }}" title="{{ ft.id }}">{{ ft.id | string | truncate( 12 )  }}</a></td>
                 {% if data['title_field'] %}
-                  <td data-label="name"><a href="{{ data['items_path']}}/{{ ft['id'] }}" title="{{ ft['properties'][data['title_field']] }}">{{ ft['properties'][data['title_field']] | truncate( 35 ) }}</a></td>
+                  <td data-label="name"><a href="{{ data['items_path']}}/{{ ft['id'] }}" title="{{ ft['properties'][data['title_field']] }}">{{ ft['properties'][data['title_field']] | string | truncate( 35 ) }}</a></td>
                 {% endif %}
                 {% for k, v in ft['properties'].items() %}
                   {% if loop.index < 5 and k not in [data['id_field'], data['title_field'], 'extent'] %}
-                  <td data-label="{{ k }}">{{ v | truncate( 35 ) }}</td>
+                  <td data-label="{{ k }}">{{ v | string | truncate( 35 ) }}</td>
                   {% endif %}
                 {% endfor %}
               </tr>