diff --git a/klippy/extras/idle_timeout.py b/klippy/extras/idle_timeout.py
index 9a4cd450..479c0b5c 100644
--- a/klippy/extras/idle_timeout.py
+++ b/klippy/extras/idle_timeout.py
@@ -71,6 +71,8 @@ class IdleTimeout:
         # Idle timeout has elapsed
         return self.transition_idle_state(eventtime)
     def timeout_handler(self, eventtime):
+        if self.printer.is_shutdown():
+            return self.reactor.NEVER
         if self.state == "Ready":
             return self.check_idle_timeout(eventtime)
         # Check if need to transition to "ready" state