Collectd-mod-ping producing NaN values

I'm trying to use collectd-mod-ping to monitor an internal connection, but the graphs it produces are always empty. I have used rrdtool dump to see the contents of the .rrd files, but all I see at the archives are "NaN" values. Is anybody else using this module, or has faced this issue? Thanks!

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It is used in Luci statistics and works quite ok there.

Could you please post your /etc/config/luci-statistics?

EDIT: After restoring the config file back to the defaults, and enabling all the modules again, it is working... looks like changing the pooling interval can cause these issues. Thanks anyway.