diff --git a/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.xml b/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.xml
index 4e754359438..205216685a8 100644
--- a/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.xml
+++ b/addons/mail/static/src/components/composer_suggested_recipient/composer_suggested_recipient.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <templates xml:space="preserve">
     <t t-name="mail.ComposerSuggestedRecipient" owl="1">
-        <div class="o_ComposerSuggestedRecipient" t-att-data-partner-id="suggestedRecipientInfo.partner and suggestedRecipientInfo.partner.id ? suggestedRecipientInfo.partner.id : false" t-att-title="ADD_AS_RECIPIENT_AND_FOLLOWER_REASON">
+        <div class="o_ComposerSuggestedRecipient" t-att-data-partner-id="suggestedRecipientInfo and suggestedRecipientInfo.partner and suggestedRecipientInfo.partner.id ? suggestedRecipientInfo.partner.id : false" t-att-title="ADD_AS_RECIPIENT_AND_FOLLOWER_REASON">
             <t t-if="suggestedRecipientInfo">
                 <div class="custom-control custom-checkbox">
                     <input t-attf-id="{{ id }}_checkbox" class="custom-control-input" type="checkbox" t-att-checked="suggestedRecipientInfo.isSelected ? 'checked' : undefined" t-on-change="_onChangeCheckbox" t-ref="checkbox" />
diff --git a/addons/mail/static/src/models/suggested_recipient_info/suggested_recipient_info.js b/addons/mail/static/src/models/suggested_recipient_info/suggested_recipient_info.js
index af9f9f2f29b..6469a7598c0 100644
--- a/addons/mail/static/src/models/suggested_recipient_info/suggested_recipient_info.js
+++ b/addons/mail/static/src/models/suggested_recipient_info/suggested_recipient_info.js
@@ -78,6 +78,7 @@ function factory(dependencies) {
          */
         thread: many2one('mail.thread', {
             inverse: 'suggestedRecipientInfoList',
+            required: true,
         }),
     };
     SuggestedRecipientInfo.identifyingFields = ['id'];
diff --git a/addons/mail/static/src/models/thread/thread.js b/addons/mail/static/src/models/thread/thread.js
index d9eb5ceb8ea..16b01f87651 100644
--- a/addons/mail/static/src/models/thread/thread.js
+++ b/addons/mail/static/src/models/thread/thread.js
@@ -2440,6 +2440,7 @@ function factory(dependencies) {
          */
         suggestedRecipientInfoList: one2many('mail.suggested_recipient_info', {
             inverse: 'thread',
+            isCausal: true,
         }),
         /**
          * Determines the last content of the last composer related to this