Strange notification on send in Kmail Version 4.12.1

ianseeks <[email protected]>
Newsgroups gmane.comp.kde.users.pim
Message-ID <[email protected]> 
Hi

I've started to occasionally get the notification below when sending an email.  
The send actually works.
Anyone know what this means?

regards

Ian

"Failed to store result in item. Item query returned empty result set"
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