diff --git a/views/plugins/views_plugin_row_rss_fields.inc b/views/plugins/views_plugin_row_rss_fields.inc
index 004ce2b..b15bd53 100644
--- a/views/plugins/views_plugin_row_rss_fields.inc
+++ b/views/plugins/views_plugin_row_rss_fields.inc
@@ -126,7 +126,14 @@ class views_plugin_row_rss_fields extends views_plugin_row {
       foreach (rdf_get_namespaces() as $prefix => $uri) {
         $xml_rdf_namespaces['xmlns:' . $prefix] = $uri;
       }
-      $this->view->style_plugin->namespaces += $xml_rdf_namespaces;
+
+      //check if namespace array is available
+      if (isset($this->view->style_plugin->namespaces) && is_array($this->view->style_plugin->namespaces)) {
+        $this->view->style_plugin->namespaces += $xml_rdf_namespaces;
+      }
+      else {
+        $this->view->style_plugin->namespaces = $xml_rdf_namespaces;
+      }
     }
 
     // Create the RSS item object.