I am getting this error every time I run the cif2cell script, How can I solve the problem?

$ cif2cell -f graphenerelaxed.cif -p quantum-espresso

Traceback (most recent call last):

File "/home/sylvester/.local/bin/cif2cell", line 1574, in

docstring = StandardDocstring()

File "/home/sylvester/.local/bin/cif2cell", line 1021, in StandardDocstring

tmpstring2 += ". Reference number : "+ref.databasecode

TypeError: must be str, not NoneType

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