Error calculating RNA-Ligand contact plots in mode "protein-ligand"

[archie18]

Example: 3ciy.pdb

andreas@andino:~/Dropbox/Uni/Drafts/dr_sasa/2w26_mol2/dr_sasa_results_PbgUlp$ /usr/local/bin/contactplot.py protein-ligand structure.LIGAND_vs_RNA.by_atom.tsv structure.atmasa --skip-non-contact  
Traceback (most recent call last):
  File "/usr/local/bin/contactplot.py", line 565, in <module>
    contactplot()
  File "/usr/local/bin/contactplot.py", line 561, in contactplot
    plot_contact_ligand_protein(tablefile, atmasafile, output, skip_none_contact)
  File "/usr/local/bin/contactplot.py", line 232, in plot_contact_ligand_protein
    df, pivot = get_ligand_protein_contact_area(tablefile, skip_none_contact)
  File "/usr/local/bin/contactplot.py", line 112, in get_ligand_protein_contact_area
    if pivot != 'column':
UnboundLocalError: local variable 'pivot' referenced before assignment