1 files changed, 3 insertions, 2 deletions
diff --git a/addons/mail/static/src/js/form_view.js b/addons/mail/static/src/js/form_view.js
index 0e1623d0dcf..6a2a41091aa 100644
--- a/addons/mail/static/src/js/form_view.js
+++ b/addons/mail/static/src/js/form_view.js
@@ -16,8 +16,9 @@ FormView.include({
     init: function () {
         this._super.apply(this, arguments);
 
-        if ('message_ids' in this.fieldsInfo[this.viewType]) {
-            this.fieldsInfo[this.viewType].message_attachment_count = {};
+        var fieldsInfo = this.fieldsInfo[this.viewType];
+        if ('message_ids' in fieldsInfo && !('message_attachment_count' in fieldsInfo)) {
+            fieldsInfo.message_attachment_count = {};
         }
     },
 });