I popped in a cd, and fired up sound-juicer. it died.
Subsequent attempts to repeat it have failed, but here's the traceback from the
coredump.

#0  update_ui_for_album (album=Variable "album" is not available.
) at sj-main.c:367
367           TrackDetails *track = (TrackDetails*)l->data;
(gdb) bt
#0  update_ui_for_album (album=Variable "album" is not available.
) at sj-main.c:367
#1  0x000000000040ed36 in metadata_cb (m=Variable "m" is not available.
) at sj-main.c:611
#2  0x0000003e4ee0ae68 in g_closure_invoke () from /usr/lib64/libgobject-2.0.so.0
#3  0x0000003e4ee1a56a in g_signal_override_class_closure () from
/usr/lib64/libgobject-2.0.so.0
#4  0x0000003e4ee1b765 in g_signal_emit_valist () from
/usr/lib64/libgobject-2.0.so.0
#5  0x0000003e4ee1ca90 in g_signal_emit_by_name () from
/usr/lib64/libgobject-2.0.so.0
#6  0x0000000000413131 in fire_signal_idle (m=Variable "m" is not available.
) at sj-metadata-musicbrainz.c:247
#7  0x0000003e4ea24e91 in g_main_context_dispatch () from
/usr/lib64/libglib-2.0.so.0
#8  0x0000003e4ea27cad in g_main_context_check () from /usr/lib64/libglib-2.0.so.0
#9  0x0000003e4ea27ffe in g_main_loop_run () from /usr/lib64/libglib-2.0.so.0
#10 0x0000003e50d0bf45 in gtk_main () from /usr/lib64/libgtk-x11-2.0.so.0
#11 0x000000000040fcd6 in main (argc=1, argv=0x7fffffc35a78) at sj-main.c:1425