[baptistemm@ivy ~]$ gnome-music 
/usr/lib64/python3.6/site-packages/gi/module.py:178: Warning: g_param_type_register_static: assertion 'g_type_name (pspec_info->value_type) != NULL' failed
  g_type = info.get_g_type()
/usr/lib64/python3.6/site-packages/gi/module.py:212: Warning: g_type_get_qdata: assertion 'node != NULL' failed
  type_ = g_type.pytype
/usr/lib64/python3.6/site-packages/gi/module.py:226: Warning: g_type_get_qdata: assertion 'node != NULL' failed
  g_type.pytype = wrapper
/usr/lib64/python3.6/site-packages/gi/module.py:226: Warning: g_type_set_qdata: assertion 'node != NULL' failed
  g_type.pytype = wrapper
/usr/lib64/python3.6/site-packages/gi/module.py:178: Warning: g_array_append_vals: assertion 'array' failed
  g_type = info.get_g_type()
/usr/lib64/python3.6/site-packages/gi/module.py:178: Warning: g_hash_table_lookup: assertion 'hash_table != NULL' failed
  g_type = info.get_g_type()
/usr/lib64/python3.6/site-packages/gi/module.py:178: Warning: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
  g_type = info.get_g_type()
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/gnomemusic/albumartcache.py", line 328, in _discovered_cb
    success, sample = tags.get_sample_index(Gst.TAG_IMAGE, index)
AttributeError: 'NoneType' object has no attribute 'get_sample_index'

