Imagify incompatibility with WordPress 5.8 Block Widget Editor

[piotrbak]

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Describe the bug
We have a fatal error when trying to edit legacy widgets when Imagify and Yoast are enabled.

To Reproduce
Steps to reproduce the behavior:

1. Make sure you have some widgets assigned to sidebars
2. Install WordPress 5.8 (https://wordpress.org/plugins/wordpress-beta-tester/)
3. Install and activate Imagify and Yoast
4. Visit the widgets section of the WordPress or check the WP Debug log
5. See error

Expected behavior
No fatal errors

Screenshots

Additional context
Full fatal error:

[11-Jun-2021 13:34:14 UTC] PHP Fatal error:  Uncaught Error: Call to undefined function get_current_screen() in /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-content/plugins/imagify/inc/3rd-party/yoast-seo.php:13
Stack trace:
#0 /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-includes/class-wp-hook.php(303): _imagify_dequeue_yoastseo_script('')
#1 /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array)
#2 /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#3 /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-includes/script-loader.php(2015): do_action('wp_print_script...')
#4 /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-includes/class-wp-hook.php(303): wp_print_head_scripts('')
#5 /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(Array, Array)
#6 /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#7 /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-includes/general-template.php(3 in /var/www/imagify.rocketlabsqa.ovh/htdocs/wp-content/plugins/imagify/inc/3rd-party/yoast-seo.php on line 13

I believe that WordPress shouldn't display errors there anyway, so here's the Github issue on Gutenberg repo:
WordPress/gutenberg#32624

Backlog Grooming (for WP Media dev team use only)

• Reproduce the problem
• Identify the root cause
• Scope a solution
• Estimate the effort

[mostafa-hisham]

I followed the steps and the error didn't show or appear in the log file
I think they fixed it in WP core
please check this
WordPress/gutenberg#32624

[iCaspar]

Indeed, these are probably related issues. That said, #567 seems to be happening on WP versions prior to 5.8. Adding the guard to check that current_screen() is indeed loaded may still be in order to prevent a fatal error in any case. See #582.