diff --git a/src/scheduler.py b/src/scheduler.py
index a4b1c09..35938cb 100644
--- a/src/scheduler.py
+++ b/src/scheduler.py
@@ -374,7 +374,7 @@ class Scheduler:
         self._save_jobs()
 
         # Send output via callback if we have something to send
-        if result_text and self._send_callback:
+        if result_text and "HEARTBEAT_OK" not in result_text and self._send_callback:
             try:
                 await self._send_callback(job["channel"], result_text)
             except Exception as exc: