no valid data between 24:00 - 8:00

[baracuda]

Hi ,
My cacti is no valid data between 24:00 -8:00 . When at 24:00 , data is lost , and 8:00 data is valid. May you help me check and fix problem ?
PHP 5.4.16
Cacti 0.8.8h
weathermap 0.98a
RRDTool 1.4.x
Centos 7

[baracuda]

May anyone help me, pls ?

[bmfmancini]

check the cacti logs during that time was the poller working ?
check cron logs durint that period of time
check mysql logs during that time
do you do a backup or something during that time ?
network activity at that time ?