diff --git a/classes/tables/comments_table.php b/classes/tables/comments_table.php
index a7e5027..7aaf509 100644
--- a/classes/tables/comments_table.php
+++ b/classes/tables/comments_table.php
@@ -134,6 +134,17 @@ public function other_cols($colname, $value) {
         }
     }
 
+    /**
+     * Format each row of returned data.
+     *
+     * @param array|object $row row of data from db used to make one row of the table.
+     * @return array one row for the table with sanitised content.
+     */
+    public function format_row($row): array {
+        $row->content = clean_param($row->content, PARAM_TEXT);
+        return parent::format_row($row);
+    }
+
     /**
      * Displays the table.
      */