Hello,
The problem relates to Screets Live Chat plugin.
Reply from the plugin author:
Open “wp-content/plugins/screets-lc/core/library/titan-framework/js/min/wp-color-picker-alpha-min.js” file
Change the content of that file with this one: https://raw.githubusercontent.com/kallookoo/wp-color-picker-alpha-plugin/master/wp-color-picker-alpha.js
Clear browser cache
Refresh chat options
You may use https://javascript-minifier.com/ to minify content of the file.
Regards