diff --git a/klippy/klippy.py b/klippy/klippy.py
index 65538aa9..217ea53b 100644
--- a/klippy/klippy.py
+++ b/klippy/klippy.py
@@ -202,7 +202,8 @@ class Printer:
     def send_event(self, event, *params):
         return [cb(*params) for cb in self.event_handlers.get(event, [])]
     def request_exit(self, result):
-        self.run_result = result
+        if self.run_result is None:
+            self.run_result = result
         self.reactor.end()