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[iPadGuy <1891740@xxxxxxxxxxxxxxxxxx>]

SUMMARY

For me, the fix was to delete a recently-created task in Evolution.

DETAILS

I encountered this error a few hours ago, after I added a task in
Evolution (something I rarely do).  I set three reminders for the task.
Within 10 minutes, the datetime indicator applet froze at 16:40.  The
Date tab in the Date/Time settng applet was also greyed-out, so I was
unable to turn it back on.  I re-booted three times, hoping it was an
update issue, but all I saw was the datetime indicator crash repeatedly
and then vanish within seconds of my logging in.

I searched /var/log/syslog for "crash" and found it was the datetime-
indicator service that had crashed.  I was able to confirm this with the
following command:

systemctl status indicator-datetime --user

I tried restarting it, but I got a message that the service had crashed
too many times.

Since I was fairly certain that this was related to the Evolution Task
that I just created, I deleted it, restarted the service, and the
datetime indicator came back.

Hopefully, this will help someone else.

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https://bugs.launchpad.net/bugs/1891740

Title:
  Indicator Applet Crashes with
  unity::indicator::datetime::DateTime::get() const: assertion failed:
  (m_dt)

Status in indicator-datetime package in Ubuntu:
  Confirmed

Bug description:
  # Problem
  When the calendar is synced to a Google calendar that contains "task" entries, the indicator applet crashes. These entries are not shown in evolution/gnome-calendar either, so this issue might originate in some library code.

  # Error Message
  The date-time indicator crashes with the following error message when started in the terminal:
  Indicator-Datetime:ERROR:/build/indicator-datetime-SpDTj1/indicator-datetime-15.10+20.04.20200217/src/date-time.cpp:171:GDateTime* unity::indicator::datetime::DateTime::get() const: assertion failed: (m_dt)
  Bail out! Indicator-Datetime:ERROR:/build/indicator-datetime-SpDTj1/indicator-datetime-15.10+20.04.20200217/src/date-time.cpp:171:GDateTime* unity::indicator::datetime::DateTime::get() const: assertion failed: (m_dt)

  # Steps to reproduce
  - Create a "task" in your Google calendar
  - Sync the Google account with the calendar using the Online Accounts application
  - the indicator applet will crash as soon as the data is synced

  # Version
  I am using the indicator applet version 15.10+20.04.20200217-0ubuntu1 on Ubuntu 20.04.

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