Calendar No view registered

I have imported hundreds of events from vbulletin.
Then I created a field with check boxes. This is displayed on calendar views.
Of course old events have no value for this field.
So for all old events it displays: No view registered

It should not display the field at all if there is no value to display.
 
What page do you get this on specifically? It's nothing to do with empty fields or data from vBulletin.
 
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