Claws-Mail suddenly crashed while I was opening a folder. A window popped up with data. The information follows:

Claws Mail version 3.8.1
GTK+ version 2.24.6 / GLib 2.28.8
Locale: C (charset: US-ASCII)
Features: IPv6 iconv compface GnuTLS LDAP GNU/aspell libetpan libSM
Operating system: FreeBSD 8.3-STABLE (amd64)
C Library: Unknown
--
[New Thread 80b6de0c0 (LWP 100338/claws-mail)]
[New Thread 80b6de280 (LWP 100320/claws-mail)]
[New Thread 809671140 (LWP 100319/claws-mail)]
[New Thread 8090041c0 (LWP 100156/initial thread)]
[Switching to Thread 80b6de0c0 (LWP 100338/claws-mail)]
0x0000000803a1a5fc in __error () from /lib/libthr.so.3
#0  0x0000000803a1a5fc in __error () from /lib/libthr.so.3
No symbol table info available.
#1  0x0000000803a18691 in pthread_cond_signal () from /lib/libthr.so.3
No symbol table info available.
#2  0x000000080d9274a6 in WebCore::IconDatabase::syncThreadMainLoop ()
   from /usr/local/lib/libwebkitgtk-1.0.so.0
No symbol table info available.
#3  0x000000080d9275ba in WebCore::IconDatabase::iconDatabaseSyncThread ()
   from /usr/local/lib/libwebkitgtk-1.0.so.0
No symbol table info available.
#4  0x0000000803a105d1 in pthread_getprio () from /lib/libthr.so.3
No symbol table info available.
#5  0x0000000000000000 in ?? ()
No symbol table info available.