Warning: count(): Parameter must be an array or an object that implements Countable in [wp-path]/wp-content/plugins/image-sizes/admin/image-sizes-settings.php on line 102
In PHP 7.x (can’t recall the exact version) if you want to count() a variable it has to actually be Countable.
Easy fix in this instance just make sure the array you’re trying to count is actually an array…
image-sizes/admin/image-sizes-settings.php — Line 102 should be:
if( is_array( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) ) :
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