Item "255451" in collection "108" has no RID.

[John Scott]

Is it possible you've imported an event from an ICS? That caused me this
error, after I copied it to my calendar for syncing. See 
https://bugs.kde.org/show_bug.cgi?id=419836

I think I might've used akonadiconsole to make it easier, but deleting the
event from my calendar fixed it.
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