Fails as described in bug #1181592 in current 15.4 alpha. I do not know whether
reopening the old bug would have been better.

Reproduction: 

1) start ipython
2) enter 'sys.' and tab+enter+enter => crash

Installed packages:

python3-jedi-0.18.0-bp154.1.1.noarch
python3-ipython_genutils-0.2.0-bp154.1.9.noarch
python3-ipython-7.13.0-bp154.1.4.noarch

The trace ends with:

  File "/usr/lib/python3.6/site-packages/IPython/core/completer.py", line 1374,
in _jedi_matches
    text[:offset], namespaces, column=cursor_column, line=cursor_line + 1)
  File "/usr/lib/python3.6/site-packages/jedi/api/__init__.py", line 726, in
__init__
    project=Project(Path.cwd()), **kwds)
TypeError: __init__() got an unexpected keyword argument 'column'