ob_end_flush() warning

<b>Notice</b>: ob_end_flush(): failed to delete and flush buffer. No buffer to delete or flush in <b>/home/cdkeysell/public_html/wp-content/plugins/iq-block-country/iq-block-country.php</b> on line <b>68</b><br />

Thanks author for the good plugin.
Please fix this warning. I’m suffering with this notice from previous version and it’s not fixed yet. I solved it on my local but it comes back again after updating this plugin. Here is a related thread to solve this: https://stackoverflow.com/questions/14549110/failed-to-delete-buffer-no-buffer-to-delete