[ZendTo] illegal attempt to update using time zendto.rrd

[Der PCFreak]

Hi all,

this might be already asked previously, but can someone help me with 
this error?

/SNIP

18,19

/usr/bin/rrdtool update /var/zendto/rrd/zendto.rrd 1389135600:2:2:512045.5

ERROR: /var/zendto/rrd/zendto.rrd: illegal attempt to update using time 
1389135600 when last update time is 1389135600 (minimum one second step)

20,21,22,23,24

/usr/bin/rrdtool update /var/zendto/rrd/zendto.rrd 1389222000:5:5:179008.9
\SNAP



I am on 4.11-14.

Greets

PCFreak
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