Update packages/sdk/src/server/async.ts

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: adolfo-pd

packages/sdk/src/server/async.ts

@@ -31,6 +31,9 @@ export class ServerAsyncResponseManager extends AsyncResponseManager {
 
   protected override async getOpts(): Promise<AsyncResponseManagerOpts> {
     const oauthToken = await this.serverOpts.getOauthToken();
+    if (!oauthToken?.token?.access_token) {
+      throw new Error('Invalid OAuth token structure');
+    }
     const token = oauthToken.token.access_token;
     const projectId = await this.serverOpts.getProjectId();
     return {