Using selection callbacks with custom rendering causes error

[d-wolf]

If i use selection callbacks to display the selected values in the Graph and setting up a customSeriesRenderer to display the areas under lines at the same time, it works well just at the beginning. If i tap the graph a multiple times, an exception will be thrown and the UI seems to be broken.

After selecting the first points everything looks fine:

A few selections later the graph is gone and labels are at the bottom of the screen:

Code:
selection_callback_example.zip

Error:
error_output.txt