[Fatal Error] Cannot use a scalar value

An error of type E-ERROR was caused in the line 5920 of the file /usr/web//wp-content/plugins/way2enjoy-compress-images/way2enjoy.php. Error message:: Uncaught Error: Cannot use a scalar value as an array in /usr/web/wp-content/plugins/way2enjoy-compress-images/way2enjoy.php:5920
Stack trace: 0 /usr/web/wp-content/plugins/way2enjoy-compress-images/way2enjoy.php(6027): Wp_Way2enjoy->optimize_image(‘/usr/web/…’, ‘lossy’) 1 /usr/web/wp-content/plugins/way2enjoy-compress-images/way2enjoy.php(3107): Wp_Way2enjoy->optimize_thumbnails(Array) 2 /usr/web/wp-includes/class-wp-hook.php(324): Wp_Way2enjoy->way2enjoy_media_library_ajax_callback_new(‘17090’) 3 /usr/web/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(”, Array) 4 /usr/web/wp-includes/plugin.php(517): WP_Hook->do_action(Array) 5 /usr/web/wp-content/plugins/way2enjoy-compress-images/lib/class-wp-way2enjoy-async.php(49): do_action(‘wp_async_wp_gen…’, ‘17090’) 6 /usr/web/wp-content/plugins/way2enjoy-compress-images/lib/wp-async-way2enjoy.php(157): WpWay2enjoyParallel->run_action() 7 /usr/web/wp-includes/class-wp-hook.php(324): WP_Parallel_Way2enjoy->handle_postback(”) 8 /usr/web/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(”, Array) 9 /usr/web/wp-includes/plugin.php(517): WP_Hook->do_action(Array) 10 /usr/web/wp-admin/admin-post.php(82): do_action(‘admin_post_wp_a…’) 11 {main}

thrown

Got this message when a client was using the plugin.
Seems like $data is not an array.