Time-series plot disappears when changing datasets

[gunbra32]

Current behaviour:

Line and dots in a time-series plot of ds1 disappear, when selecting another dataset ds2 from the drop-down menu. The empty time-series plot remains though. Generating a time-series plot for the now selcted ds2 works as expected by creating a new plot into which the data is drawn. When returning to ds1, the corresponding lines and dots appear again but now all time-series plots from ds2 disappear.

Expected behaviour:

All time-series plots remain visibile regardless of the selection of the data set.