Could libetpan parse IMAP bodystructure via google IMAP?

Hi libetpan guys

I use readmsg sample to get a message from google IMAP.
but it happen segmentation fault
I add libetpan debug message mode (mailstream_debug = 1) to try again
It seem like libetpan-0.52 could not parse IMAP bodystructure message completely, it result in segmentation fault
There is this imap bodystructure message.

Thank you :)

ps. google imap server: imap.gmail.com:993
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>>>>>>> send >>>>>>
3 UID FETCH 317 (UID BODYSTRUCTURE ENVELOPE)

>>>>>>> end send >>>>>>
<<<<<<< read <<<<<<
* 34 FETCH (UID 317 ENVELOPE ("Fri, 23 Nov 2007 19:40:16 +0800" "=?BIG5?B?SG9sbHl3b29kpF23UqXOqrq4Z6jlU3RlbHRvbg==?=" (("=?BIG5?B?pV+82sNvtaE=?=" NIL "nordicepaper" "nordic.com.tw")) (("=?BIG5?B?pV+82sNvtaE=?=" NIL "nordicepaper" "nordic.com.tw")) (("=?BIG5?B?pV+82sNvtaE=?=" NIL "nordicepaper" "nordic.com.tw")) ((NIL NIL "beferxiang" "gmail.com")) NIL NIL NIL "<[email protected]>") BODYSTRUCTURE (("TEXT" "PLAIN" ("charset" "big5") NIL NIL "7bit" 913 0)("TEXT" "HTML" NIL NIL NIL "8bit" 1907 0) "ALTERNATIVE"))
3 OK Success

<<<<<<< end read <<<<<<