diff --git a/includes/views_matrix_plugin_style_matrix.inc b/includes/views_matrix_plugin_style_matrix.inc
index 90ee144..3e082ed 100644
--- a/includes/views_matrix_plugin_style_matrix.inc
+++ b/includes/views_matrix_plugin_style_matrix.inc
@@ -139,6 +139,6 @@ class views_matrix_plugin_style_matrix extends views_plugin_style {
       $class = $field_handler->tokenize_value($class, $row_index);
       $class = views_clean_css_identifier($class);
     }
-    return $classes;
+    return $classes !== FALSE ? $classes : array();
   }
 }