If you go to remove the last Internet radio station in a category, you get an assertion failure and RB dies.  In the example below, I was removing the one entry in the "Trance" category (HBR1.com). I can reproduce this using any category. Upon restart, I note that both HBR1.com and the category Trance are still present, implying the delete didn't succeed. I'm not sure why in the logs below it appears to want to delete everything, perhaps a mistake in the logging.

Here are the logs:

(12:47:43) [0x7f1530003ad0] [rb_shell_clipboard_cmd_delete] rb-shell-clipboard.c:752: delete
(12:47:43) [0x7f1530003ad0] [rhythmdb_entry_delete] rhythmdb.c:3704: deleting entry 0x7f15180117f0
(12:47:43) [0x7f1530003ad0] [rhythmdb_query_model_base_row_deleted] rhythmdb-query-model.c:2695: deleting entry 0x7f15180117f0 from base model 0x1251d40 to model 0x1251e00
(12:47:43) [0x7f1530003ad0] [rb_entry_view_row_deleted_cb] rb-entry-view.c:2131: row deleted
(12:47:43) [0x7f1530003ad0] [rb_shell_clipboard_entries_changed_cb] rb-shell-clipboard.c:817: entryview changed
(12:47:43) [0x7f1530003ad0] [rb_random_play_order_get_previous] rb-play-order-random.c:395: choosing history entry
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Ambient": refcount: 1
(12:47:43) [0x7f1530003ad0] [rb_property_view_selection_changed_cb] rb-property-view.c:839: selection changed
(12:47:43) [0x7f1530003ad0] [rb_property_view_selection_changed_cb] rb-property-view.c:839: selection changed
(12:47:43) [0x7f1530003ad0] [rhythmdb_query_model_chain] rhythmdb-query-model.c:896: query model 0x1251c80 chaining to base model (nil)
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Music": refcount: 2
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Music": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "80's": refcount: 2
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "80's": refcount: 1
(12:47:43) [0x7f1530003ad0] [rb_property_view_selection_changed_cb] rb-property-view.c:839: selection changed
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Rock'n'Roll": refcount: 2
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Rock'n'Roll": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "90's": refcount: 2
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "90's": refcount: 1
(12:47:43) [0x7f1530003ad0] [rb_property_view_selection_changed_cb] rb-property-view.c:839: selection changed
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Underground": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "College Radio": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Eclectic": refcount: 2
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Eclectic": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 15
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 14
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 13
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 12
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 11
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 10
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 9
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 8
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 7
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 6
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 5
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 4
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 3
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 2
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Unknown": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "News": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Pop": refcount: 2
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Pop": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Drum & Bass": refcount: 1
(12:47:43) [0x7f1530003ad0] [rb_property_view_selection_changed_cb] rb-property-view.c:839: selection changed
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "Trance": refcount: 1
(12:47:43) [0x7f1530003ad0] [rhythmdb_property_model_delete_prop] rhythmdb-property-model.c:863: deleting "House": refcount: 1
**
RhythmDB:ERROR:rhythmdb-property-model.c:379:rhythmdb_property_model_set_query_model_internal: assertion failed: (rhythmdb_property_model_iter_n_children (GTK_TREE_MODEL (model), NULL) == 1)