KeyError: 'address 139921041104544 not present'

[robochat]

Using meliae via pyrasite on python3, I'm seeing this area when meliae tries to load the memory dump:

Traceback (most recent call last):sed        0    
  File "/opt/virtualenv/traffic5_venv/bin/pyrasite-memory-viewer", line 8, in <module>
    sys.exit(main())
  File "/opt/virtualenv/traffic5_venv/lib64/python3.6/site-packages/pyrasite/tools/memory_viewer.py", line 150, in main
    objects = loader.load(filename)
  File "/opt/virtualenv/traffic5_venv/lib64/python3.6/site-packages/meliae/loader.py", line 562, in load
    if not manager.collapse_instance_dicts():
  File "/opt/virtualenv/traffic5_venv/lib64/python3.6/site-packages/meliae/loader.py", line 432, in collapse_instance_dicts
    obj_1, obj_2 = obj
  File "meliae/_loader.pyx", line 481, in meliae._loader._MemObjectProxy.__getitem__
  File "meliae/_loader.pyx", line 477, in meliae._loader._MemObjectProxy.__getitem__
  File "meliae/_loader.pyx", line 767, in meliae._loader.MemObjectCollection.__getitem__
KeyError: 'address 139921041104544 not present'