summary step fails

I've gotten a successful run all the way up to and including calibraiton combining the fixes for #9 (closed) and LINC!169 (merged). Now it crashes at the very last summary step:

Error.  nthreads cannot be larger than environment variable "NUMEXPR_MAX_THREADS" (64)Cannot find solset: .
Traceback (most recent call last):
  File "/data2/sweijen/tmp.36jKqMJsSE/LINC/scripts/make_summary.py", line 239, in <module>
    main(flagFiles = args.flagFiles, pipeline = args.pipeline, run_type = args.run_type, filtered_antennas = args.filtered_antennas, bad_antennas = args.bad_antennas, output_fname = args.output_fname, structure_file = args.structure_file, Ateam_separation_file = args.Ateam_separation_file, solutions = args.solutions, clip_sources = args.clip_sources, demix_sources = args.demix_sources, demix = args.demix, removed_bands = args.removed_bands, min_unflagged = args.min_unflagged, refant = args.refant)
  File "/data2/sweijen/tmp.36jKqMJsSE/LINC/scripts/make_summary.py", line 42, in main
    solset   = data.getSolset(run_type)
  File "/opt/lofar/pyenv-py3/lib/python3.10/site-packages/losoto/h5parm.py", line 254, in getSolset
    raise Exception("Cannot find solset: "+solset+".")
Exception: Cannot find solset: .
Closing remaining open files:/data2/sweijen/tmp.36jKqMJsSE/tmpdir_VLBI_CWL/9pqpwqr6/stg82a9935c-091f-4d5c-82d5-39488e60e7f2/merged_addCS_selfcalcyle009_linearfulljones_ILTJ155955.03+304223.7_143MHz_uv.dp3-concat.copy.phaseup.h5...done
~ 

I've traced it back to --run_type '' being left empty when make_summary.py is called, which seems to serve as the name of the solset to look for.