Fatal Error in WP Smush Pro, bug?

I identified a error in error_log. What is happened? Can help me?

[16-Dec-2016 00:10:12 UTC] PHP Fatal error: Cannot use string offset as an array in /home/fva/public_html/wp-content/plugins/wp-smush-pro/lib/class-wp-smush-admin.php on line 1414
[16-Dec-2016 00:10:17 UTC] PHP Fatal error: Cannot use string offset as an array in /home/fva/public_html/wp-content/plugins/wp-smush-pro/lib/class-wp-smush-admin.php on line 1414

Best reggards,
Marcelo R. Berwanger