diff --git a/addons/survey/controllers/main.py b/addons/survey/controllers/main.py
index 80b17617f47..300367cefcb 100644
--- a/addons/survey/controllers/main.py
+++ b/addons/survey/controllers/main.py
@@ -535,7 +535,7 @@ class Survey(http.Controller):
                 if not isinstance(answers, list):
                     answers = [answers]
                 for answer in answers:
-                    if 'comment' in answer:
+                    if isinstance(answer, dict) and 'comment' in answer:
                         comment = answer['comment'].strip()
                     else:
                         answers_no_comment.append(answer)