Error when selecting water level data

[jnsebgosselin]

What steps will reproduce the problem?

1. Load a water level dataset
2. Select some data that are not continuous

Loading project from 'Example.gwt'... done
C:\Users\User\gwhat\gwhat\HydroCalc2.py:1386: RuntimeWarning: invalid value encountered in greater_equal
  (self.water_lvl >= min(y_click, y_rel)) &
C:\Users\User\gwhat\gwhat\HydroCalc2.py:1387: RuntimeWarning: invalid value encountered in less_equal
  (self.water_lvl <= max(y_click, y_rel))

Please provide any additional information below

The error pops-up, but everything seems to be working fine though.