this report has been filed here:

https://bugs.launchpad.net/ubuntu/+source/gthumb/+bug/537238

"gthumb 3:2.11.1-2ubuntu1 (ubuntu lucid)

gthumb crashes if dbus has been restarted. I looked over the source codes. This small patch fixes the problem.

below is patch that fixes use of uninitialized variable leading to crash when
dbus is restarted (and ck session is lost).

Signed-off-by: Lukas Hejtmanek <xhejtman@ics.muni.cz>

diff -rNu a/gthumb/gth-icon-cache.c b/gthumb/gth-icon-cache.c
--- a/gthumb/gth-icon-cache.c 2010-03-11 10:54:10.673089507 +0100
+++ b/gthumb/gth-icon-cache.c 2010-03-11 10:51:53.000000000 +0100
@@ -118,7 +118,7 @@
 gth_icon_cache_get_pixbuf (GthIconCache *icon_cache,
                           GIcon *icon)
 {
- const char *key;
+ const char *key=0;
        GdkPixbuf *pixbuf;

        if (icon != NULL)
"