diff --git a/mod/feedback/item/multichoice/lib.php b/mod/feedback/item/multichoice/lib.php
index 7f097baf613..5024f654fe0 100644
--- a/mod/feedback/item/multichoice/lib.php
+++ b/mod/feedback/item/multichoice/lib.php
@@ -491,6 +491,9 @@ class feedback_item_multichoice extends feedback_item_base {
 
     function create_value($data) {
         $vallist = $data;
+        if (is_array($vallist)) {
+            $vallist = array_unique($vallist);
+        }
         return trim($this->item_arrayToString($vallist));
     }