AttributeError: 'NoneType' object has no attribute 'GetBondType' when running denovo.py

[shiokoo]

Hello,

I encountered an issue while running the denovo.py script. Specifically, I received the following error message:

bondtype_frag = fragment_mol.GetBondBetweenAtoms(v_idx, v1_idx).GetBondType()
AttributeError: 'NoneType' object has no attribute 'GetBondType'

Due to this bug, I can't reproduce the result in the paper. Could you please help me troubleshoot this problem? Any guidance on what might be causing this error and how to fix it would be greatly appreciated.

Thank you!