Keyword 'Take Screenshot' could not be run on failure: 'NoneType' object is not iterable

Trying to get screenshot on failure, but getting only this message: Keyword 'Take Screenshot' could not be run on failure: 'NoneType' object is not iterable

In the same time if I explicitly putting keyword Take Screenshot im my .robot file screenshot is successfully saved.

I tried official image marketsquare/robotframework-browser and got the same behavior. requirements.txt:

robotframework==4.0
robotframework-browser==4.1.0

Robot-file:

*** Settings ***
Library  Browser
*** Settings ***
Suite Setup  Enter LK
*** Keywords ***
Enter LK
    new page  %{URL}
    get title  ==   Asserted title
    fill text  xpath=//input[@name='username']    %{USERNAME}
    click  "Enter"
    fill text  xpath=//input[@name='password']    %{PASSWORD}
    click  "Enter"
    wait for elements state  "Main"  timeout=10
*** Test Cases ***
Successeful login
    [Tags]  Smoke
    get element state  "Exit"   attached  ==  ${True}

What I’m doing wrong? A couple months ago it was working.

Update: when I wrote explicitly

        run_on_failure: str = "Browser.Take Screenshot",

instead of

        run_on_failure: str = "Take Screenshot",

in line 621 (https://github.com/MarketSquare/robotframework-browser/blob/master/Browser/browser.py#L621)

It saved screenshots but it doesn’t looks like correct behavior. Maybe there are mistakes in test setup?

[Ivan-Feofanov]

It is hard to say, but would it be possible to see full stack trace from the test? You can get it by running tests with --loglevel trace .

Output isn’t changed. As my investigation shows it can happens because variable test_name here evaluates in None

[allcontributors[bot]]

@Ivan-Feofanov

@Ivan- already contributed before to bug, bug