diff --git a/src/lib.rs b/src/lib.rs
index 49dff2a..12979c6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -46,12 +46,12 @@ impl ThebAI {
             }
         } else {
             return ThebAI {
-                parent_message_id: String::from("8c00bd29-75b0-42c7-9d4f-05a94ac8b2de"),
+                parent_message_id: Some(String::from("8c00bd29-75b0-42c7-9d4f-05a94ac8b2de")),
             }
         }
     }
 
-    pub async fn ask(&self, prompt: &str, parent_message_id: Option<String>) -> Result<Vec<Delta>, Box<dyn std::error::Error>> {
+    pub async fn ask(&mut self, prompt: &str, parent_message_id: Option<String>) -> Result<Vec<Delta>, Box<dyn std::error::Error>> {
 
         let mut body = String::new();
         body.push_str(r#"{