Seems this is Revolution Slider issue because we found another user with the same warning https://codecanyon.net/item/slider-revolution-responsive-wordpress-plugin/2751380/comments?page=944&filter=all#comment_21470651
What version of Revolutions slider and PHP do you use?
Try to downgrade the PHP version to 7.3.1 and check if it helps. I suppose Revolution slider developers will fix this warning in the next plugin updates because we are not plugin developers we just include it to our theme.
The Revolution slider is Version 126.96.36.199 and PHP is already 7.3.1
Then try PHP 7.2.
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