error The getter 'month' was called on null.

I have this problem when I try to refresh something from the table:

Exception has occurred.
NoSuchMethodError (NoSuchMethodError: The getter 'month' was called on null.
Receiver: null
Tried calling: month)

In my application I have a lot of users, and a calendar for each user (to put the day they enter).

i try using a single CalendarController () or make a fixed list to have a CalendarController for each one, but when I want to modify something I get the error that a month, I get null, for example, I have another calendar that would filter by days (to see which people entered that day). and the initial day works great, changing it I get this error. It also happens to me with the hot restart.

any clue? the calendar works great, i have the days of the firebase, and work fine. but filtering or refreshing have this problem.

该报告没有指出任何仓库文件、测试或可复现的入口点。首先，使用 CalendarController 和 Firebase-backed dates，复现其中描述的日历刷新和筛选流程，然后确定读取 null month 的位置。当原因得到确认，并且该行为由回归测试或有文档记录的 fix 覆盖时，即视为完成。

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