Hopefully temporary (probably not) fix

src/Chat.ts

@@ -45,7 +45,7 @@ export default class Chat {
   #client: Client;
 
   public characterId: string;
-  public characterInternalId: string;
+  public characterInternalId?: string;
   public historyId: string;
 
   constructor(client: Client, id: string, history: any) {
@@ -53,9 +53,9 @@ export default class Chat {
 
     this.characterId = id;
     this.historyId = history.external_id;
-    this.characterInternalId = history.participants.find(
+    // this.characterInternalId = history.participants.find(
-      (participant: any) => participant.is_human === false
+    //   (participant: any) => participant.is_human === false
-    ).user.username;
+    // ).user.username;
   }
 
   /**
@@ -84,6 +84,11 @@ export default class Chat {
    * @returns Object with replies
    */
   public async sendMessage(message: string): Promise<Reply> {
+    if (!this.characterInternalId)
+      this.characterInternalId = (
+        await this.#client.fetchCharacterInfo(this.characterId)
+      ).participant__user__username;
+
     const payload = {
       history_external_id: this.historyId,
       character_external_id: this.characterId,