PHP 7.4 Error Deprecated

Deprecated:  Array and string offset access syntax with curly braces is deprecated in .../wp-content/plugins/clearfy/components/minify-and-combine/includes/classes/class-helper.php on line 205

Warning: Cannot modify header information - headers already sent by (output started at .../wp-content/plugins/clearfy/components/minify-and-combine/includes/classes/class-helper.php:205) in .../wp-includes/functions.php on line 6029

Warning: Cannot modify header information - headers already sent by (output started at .../wp-content/plugins/clearfy/components/minify-and-combine/includes/classes/class-helper.php:205) in .../wp-admin/includes/misc.php on line 1252

Warning: Cannot modify header information - headers already sent by (output started at .../wp-content/plugins/clearfy/components/minify-and-combine/includes/classes/class-helper.php:205) in .../wp-admin/admin-header.php on line 9

When Disable Minify and Combine module – everithing OK
This warning is on PHP 7.4