PHP Fatal error: Uncaught Error: Cannot use string offset as an array

Getting the following errors in our logs?

Stack trace:
#0 E:\ccc\ccc-cms\wp-content\plugins\wp-super-cache\wp-cache-phase2.php(314): wp_cache_shutdown_callback()
#1 [internal function]: wp_cache_ob_callback(”, 9)
#2 E:\ccc\ccc-cms\wp-includes\functions.php(3673): ob_end_flush()
#3 E:\ccc\ccc-cms\wp-includes\class-wp-hook.php(298): wp_ob_end_flush_all(”)
#4 E:\ccc\ccc-cms\wp-includes\class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array)
#5 E:\ccc\ccc-cms\wp-includes\plugin.php(453): WP_Hook->do_action(Array)
#6 E:\ccc\ccc-cms\wp-includes\load.php(670): do_action(‘shutdown’)
#7 [internal function]: shutdown_action_hook()
#8 {main}
thrown in E:\ccc\ccc-cms\wp-content\plugins\wp-super-cache\wp-cache-phase2.php on line 880