The Training Effect has not been calculated on my last run (Aerobic 0.0 / Anaerobic 0.0 / Load 0).
I assumed this is due to the HR partially recorded, since my watch switched to energy saving mode for the last 5min of my run, then ran out of power.
A better approach would have been to calculate the Training Effect anyway with partial data (eg. if HR has been recorded over more than 85% of the training).