ob_get_clean(): failed to discard buffer + failed to delete buffer

Replies: 0

After upgrade my site I often get message with Error 500 (must reloading site)

All-in-One Event Calendar by Time.ly
Verzia 2.5.14 | Od

All-in-One Event Calendar Extended Views by Time.ly
Verzia 1.2.10

Log:

[02-Jan-2017 13:05:15 UTC] All-in-One Event Calendar: ob_get_clean(): failed to discard buffer of zlib output compression (1) @ /hosting/kremnica.sk/wp-content/plugins/all-in-one-event-calendar/lib/global-functions.php:38 #8
[02-Jan-2017 13:05:15 UTC] All-in-One Event Calendar: ob_get_clean(): failed to delete buffer of zlib output compression (1) @ /hosting/kremnica.sk/wp-content/plugins/all-in-one-event-calendar/lib/global-functions.php:38 #8 

PHP Info:
PHP Version : 5.5.9
PHP Memory Usage: 68.56 MB
PHP Memory Limit : 256M
PHP Max Upload Size : 128M
PHP Max Post Size : 128M
PHP Allow URL fopen : On
PHP Allow URL Include : Off
PHP Display Errors : Off
PHP Max Script Execution Time : 600 Seconds