Pytest: `pytest_report_from_serializable` KeyError: 'chain'

[wy-z]

https://github.com/pytest-dev/pytest/blob/e4103cb02c9dd2cbda8ba44fce71b89e632bd2b0/src/_pytest/reports.py#L460
There may be no chain in reportdict["longrepr"].

[wy-z]

@nicoddemus

[blueyed]

@wy-z

1. Please paste tracebacks not as screenshots.
2. use stable URLs, i.e. press "y" before yanking the url for a GitHub link (it will use the sha then instead of the ref - "master" will change in the future)

[wy-z]

So sorry for my imperence.
Once I encounter the error again, I will update the traceback.
Thanks for your response, I am your fan. @blueyed

[nicoddemus]

@wy-z that's strange in the sense that hasn't appear sooner. Could you please post a reproducible example? Thanks

[blueyed]

Also information about the pytest version, and from "pip freeze" would be required/useful.

[wy-z]

pytest version

pytest==5.1.2
pytest-base-url==1.4.1
pytest-forked==1.0.2
pytest-html==2.0.0
pytest-instafail==0.4.1
pytest-metadata==1.8.0
pytest-repeat==0.8.0
pytest-rerunfailures==7.0
pytest-selenium==1.17.0
pytest-variables==1.8.0
pytest-xdist==1.29.0
python-dateutil==2.8.0

[wy-z]

I wil try to provide a reproducible example tomorrow.
With my respectful regards. @nicoddemus

[nicoddemus]

Sure, thank you!

[wy-z]

It seems that the cause of this exception is pytest version mismatch.
Someone put some old version reports into redis causing the exception.
It's not an issue of pytest, I will close this.
Thanks again for your contribution. @nicoddemus @blueyed
Pytest is great!

[nicoddemus]

Thanks @wy-z!