GSMtricks on "[Plugin: W3 Total Cache] PHP Warning: stristr(): Empty needle"

After make all settings plugin works, but have many many errors and my error log file is 100mb for 1 week just.

Here is the errors:

[30-Mar-2014 22:58:23 UTC] PHP Warning:  stristr(): Empty needle in /home/xx/public_html/wp-content/plugins/w3-total-cache/lib/Minify/Minify/IgnoredCommentPreserver.php on line 36
[30-Mar-2014 22:58:23 UTC] PHP Warning:  stristr(): Empty needle in /home/xx/public_html/wp-content/plugins/w3-total-cache/lib/Minify/Minify/HTML.php on line 162

What is wrong and is there any fix for this?

https://wordpress.org/plugins/w3-total-cache/