diff --git a/public/scripts/openai.js b/public/scripts/openai.js
index 7a4c35dcb..e3924d273 100644
--- a/public/scripts/openai.js
+++ b/public/scripts/openai.js
@@ -1106,7 +1106,7 @@ class ChatCompletion {
         this.validateMessageCollection(collection);
         this.checkTokenBudget(collection, collection.identifier);
 
-        if (position) {
+        if (null !== position && -1 !== position) {
             this.messages.collection[position] = collection;
         } else {
             this.messages.collection.push(collection);