Influxdb connector may return negative times

[CLKBlu3]

As title says, some times it seems like the avg session time returned by the influxdb connector contains or calculates the timestamps wrongly, returning a negative value, i.e:

{
"averageMatchedUtteranceCount":1.5333333333333334,
"averageUnmatchedUtteranceCount":1.4,
"averageSessionTime":-2.8295333333333335
}