[Evolution] Threaded View crash

[Alec Peden <pezking jaded org>]

If i turn on Threaded View and try to access one of my folders on an
IMAP server, the mail component will crash. This doesnt happen on all my
folders but it will happen on the same ones. Here is a backtrace from
gdb. 

#0  0x8083138 in new_id_from_subject (ml=0x81a0468, subject=0x0)
    at message-list.c:1520
#1  0x8083270 in build_subtree (ml=0x81a0468, parent=0x81aeff8, 
c=0x81bfbd4,
    row=0xbffff354, expanded_nodes=0x81a2208) at message-list.c:1552
#2  0x8082fd3 in build_tree (ml=0x81a0468, thread=0x81bf528,
changes=0x0)
    at message-list.c:1483
#3  0x8084d59 in cleanup_regenerate_messagelist (in_data=0x81befe8,
    op_data=0x81bf030, ex=0x81bf048) at message-list.c:2478
#4  0x807b011 in runcleanup (source=0x81bf058, cond=G_IO_IN,
d=0x81bf008)
    at mail-ops.c:2155
#5  0x40754cd9 in g_io_unix_dispatch () from /usr/lib/libglib-1.2.so.0
#6  0x40371a38 in __pthread_mutex_lock (mutex=0x17e9c381) at mutex.c:76
#7  0x5b000000 in ?? ()




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