guard converting thermo output from other output to the screen and do not crash

            r = {'thermo' : thermo_data }

            runs.append(namedtuple('Run', list(r.keys()))(*list(r.values())))

        elif in_run and len(columns) > 0:

            values = [float(x) for x in line.split()]

            items = line.split()

            # Convert thermo output and store it.

            # It must have the same number of columns and

            # all of them must be convertable to floats.

            # Otherwise we ignore the line

            if len(items) == len(columns):

                try:

                    values = [float(x) for x in items]

                    for i, col in enumerate(columns):

                        current_run[col].append(values[i])

                except ValueError:

                  pass

    return runs

class PyLammps(object):