Crash when hitting return during a search started from within a mailbox

[GustavoJoseph]

Open a mailbox (a large mailbox will work best, but really, any mailbox), go into the search box in the mailbox and type something, whatever it is. Then, as the search is running, hit return. Mulberry puts up a dialog "A problem occurred while decoding the information sent from the server. The operation has been cancelled." Mulberry then crashes.

This crash has existed for a long time (I don't remember how long), I just had never remembered to report it.