diff --git a/pibooth_telegram_upload.py b/pibooth_telegram_upload.py
index 15d44ae..f5d03a2 100644
--- a/pibooth_telegram_upload.py
+++ b/pibooth_telegram_upload.py
@@ -53,7 +53,7 @@ def pibooth_startup(app, cfg):
             + SECTION
             + "][telegram_chat_id], uploading deactivated"
         )
-    elif not telegram_chat_id:
+    elif not telegram_thread_id:
         LOGGER.error(
             "Telegram Thread ID not defined in ["
             + SECTION