HELP Error in LOG

Hello, I see this error with frequency, could not identify the reason …
Could guide me?

<errormsg> ob_end_flush(): failed to delete and flush buffer. No buffer to delete or flush</errormsg>
<errornum>8</errornum>
<errortype>Notice</errortype>
<scriptname >D:\Sistemas\TEST\lib\pages\display.class.php</scriptname>
<scriptlinenum>1076</scriptlinenum>

It is safe to ignore that notice - you shouldn’t see it with debugging off.