diff --git a/addons/mail/static/src/models/thread_cache.js b/addons/mail/static/src/models/thread_cache.js
index 4517c15eb09..0aaa201cb77 100644
--- a/addons/mail/static/src/models/thread_cache.js
+++ b/addons/mail/static/src/models/thread_cache.js
@@ -53,7 +53,7 @@ registerModel({
                 return;
             }
             const messageIds = this.fetchedMessages.map(message => message.id);
-            const fetchedMessages = this._loadMessages({ minId: Math.max(...messageIds) });
+            const fetchedMessages = this._loadMessages({ minId: Math.max(...messageIds, 0) });
             if (!fetchedMessages || fetchedMessages.length === 0) {
                 return;
             }