diff --git a/utils/watch.js b/utils/watch.js
index 236a6f5..02531d8 100644
--- a/utils/watch.js
+++ b/utils/watch.js
@@ -175,7 +175,7 @@ class Watch {
         }
         
         // End startAlertTimer if startAlert started timer with delay
-        if (this.#watchObjects[watchUUID].startAlertTimer.isActive()) {
+        if (this.#watchObjects[watchUUID].hasOwnProperty('startAlertTimer') && this.#watchObjects[watchUUID].startAlertTimer.isActive()) {
             console.log('Cancel startAlertTimer');
             this.#watchObjects[watchUUID].startAlertTimer.cancel();
         }