Sorry; this one's my fault.  You should apply
id:1370272679-20175-1-git-send-email-amdragon@mit.edu, which is
currently sitting the ready queue, but hasn't been pushed to master
yet.

Quoth Aneesh Kumar K.V on Jun 04 at 10:43 am:
> 
> I started seeing this with latest notmuch update.
> 
> Debugger entered--Lisp error: (wrong-type-argument listp t)
>   memql(:notmuch-part t)