Problem with Ultimate Smart Pinger log

I have a problem with my pinger log, therefore, do not know if my pings are working. This error message is log. Any help would be greatly appreciated.

Thanks.

Warning: array_slice() expects parameter 1 to be array, boolean given in /home/stroker/public_html/wp-content/plugins/ultimate-plugins-smart-update-pinger.php on line 256

Warning: array_reverse() [function.array-reverse]: The argument should be an array in /home/stroker/public_html/wp-content/plugins/ultimate-plugins-smart-update-pinger.php on line 256

Warning: Invalid argument supplied for foreach() in /home/stroker/public_html/wp-content/plugins/ultimate-plugins-smart-update-pinger.php on line 258