diff --git a/config/packages/events.yaml b/config/packages/events.yaml
index c708914..7383cb2 100755
--- a/config/packages/events.yaml
+++ b/config/packages/events.yaml
@@ -99,7 +99,12 @@ sensor:
         value_template: "{{ ((state_attr('input_datetime.school_last_day', 'timestamp')-as_timestamp(now())) | int /60/1440) | round(0) }}"
         unit_of_measurement: 'Days'
       vacation_days2go:
-        value_template: "{{ ((as_timestamp(strptime(state_attr('calendar.vacation', 'start_time'), '%Y-%m-%d'))-as_timestamp(now())) | int /60/1440) | round(0) }}"
+        value_template: >
+          {% if state_attr('calendar.vacation', 'start_time') %}
+            {{ ((as_timestamp(strptime(state_attr('calendar.vacation', 'start_time'), '%Y-%m-%d'))-as_timestamp(now())) | int /60/1440) | round(0) }}
+          {% else %}
+            999
+          {% endif %}
         unit_of_measurement: 'Days'
   - platform: rest
     resource: https://raw.githubusercontent.com/thejeffreystone/home-assistant-configuration/master/config/packages/json_data/school.json