diff --git a/questiontype.php b/questiontype.php
index 7f6b853..585afa2 100644
--- a/questiontype.php
+++ b/questiontype.php
@@ -118,7 +118,7 @@ public function save_units($formdata) {
             if (html_is_blank($formdata->unitsfeedback[$i]['text'])) {
                 $formdata->unitsfeedback[$i]['text'] = '';
             }
-            if (html_is_blank($formdata->spacesfeedback[$i]['text'])) {
+            if (!array_key_exists('text', $formdata->spacesfeedback[$i]) || html_is_blank($formdata->spacesfeedback[$i]['text'])) {
                 $formdata->spacesfeedback[$i]['text'] = '';
             }
             $this->save_unit($table,