Critical error after update from 1.3.30 to 1.3.32

If you have a previous Duplicator backup, open the ..archive.zip file, wp-content\plugins\ and copy wp-content\plugins\duplicator to your life web site wp-content\plugins\duplicator folder.

I guess there is a conflict with one of my web site plugins. I will try disabling them one by one to see which one could cause the issue. You may want to do same thing before going back to 1.3.30 and post your results here.

Disabled plugins one by one – did not help.

Here is more info:

MySQL Version 5.7.28
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When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.4.1
Current theme: Graphene Child (version 1.0)
Current plugin: Duplicator (version 1.3.32)
PHP version 7.2.25

Error Details
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An error of type E_ERROR was caused in line 69 of the file /services/webpages/n/i/nifty….org/public/wordpress/wp-content/plugins/duplicator/classes/ui/class.ui.screen.base.php. Error message: Uncaught Error: Call to undefined function array_key_first() in /services/webpages/n/i/nifty….org/public/wordpress/wp-content/plugins/duplicator/classes/ui/class.ui.screen.base.php:69
Stack trace:
#0 /services/webpages/n/i/nifty….org/public/wordpress/wp-content/plugins/duplicator/classes/ui/class.ui.screen.base.php(47): DUP_UI_Screen::getCurrentColorScheme()
#1 /services/webpages/n/i/nifty….org/public/wordpress/wp-includes/class-wp-hook.php(287): DUP_UI_Screen::getCustomCss(”)
#2 /services/webpages/n/i/nifty….org/public/wordpress/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#3 /services/webpages/n/i/nifty….org/public/wordpress/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#4 /services/webpages/n/i/nifty….org/public/wordpress/wp-admin/admin-header.php(149): do_action(‘admin_head’)
#5 /services/webpages/n/i/nifty….org/public/wordpress/wp-admin/admin.php(234): require_once(‘/services/webpa…’)
#6 {main}
thrown