FormatException: FormatException: Invalid number (at character 1)

[sentry-io]

Sentry Issue: GLUT-ASSISTANT-N-32

FormatException: FormatException: Invalid number (at character 1)

^
  File "integers_patch.dart", line 125, in int._handleFormatError
  File "integers_patch.dart", line 51, in int.parse
  File "get.dart", line 115, in getSchedule
    {"year": ((int.parse(AppData.persistentData["year"]!)) - 1980).toString(), "term": AppData.persistentData["semester"] == "秋" ? "3" : "1"});
  File "<asynchronous suspension>"
  File "home.dart", line 210, in HomePageState._refresh.<T>
    await _scheduleParser(await getSchedule());

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