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Co-authored-by: HeJ <hej@c3pb.de>

src/core/schedules/schedulejson.py

@@ -104,7 +104,7 @@ class ScheduleJSONSupport(BaseScheduleSupport):
         if self.conf_value('feedback'):
             data['feedback_url'] = f"{event['url']}feedback/"
         if self.conf_value('legacy_id_offset'):
-            data['id'] = event['id'] + self.conf_value('legacy_id_offset')
+            data['id'] = int(event['id']) + int(self.conf_value('legacy_id_offset') or 0)
 
         return data