It looks like the data points given to plots only contain sat/unsat/... results (i.e. builtins tags), but ignores custom tags. For a run that only uses custom tags this result in the following error (from benchpress-server logs):
line 1: warning: Skipping data file with no valid points
gnuplot> plot '-' using 1:2 with linespoints t "dolmen"
^
line 1: x range is invalid
It looks like the data points given to plots only contain sat/unsat/... results (i.e. builtins tags), but ignores custom tags. For a run that only uses custom tags this result in the following error (from benchpress-server logs):