IndigoException: stoi when reading USPTO CDX file

[eloyfelix]

Steps to Reproduce

1. Use Indigo library (Bingo cartridge). Describe environment
   Indigo built from master branch, commit: 1fd76de
   Python 3.11.3 in Ubuntu Linux

2. Add script or SQL to reproduce the issue

from indigo import Indigo

indigo = Indigo()

for mol in indigo.iterateCDXFile("US06168934-20010102-C00008.CDX"):
    print("heavy atoms:", mol.countHeavyAtoms())
    print("smiles:", mol.smiles())

---------------------------------------------------------------------------
IndigoException                           Traceback (most recent call last)
Cell In[18], line 6
      3 indigo = Indigo()
      5 for mol in indigo.iterateCDXFile("US06168934-20010102-C00008.CDX"):
----> 6     print("heavy atoms:", mol.countHeavyAtoms())
      7     print("smiles:", mol.smiles())

File [~/.pyenv/versions/3.11.3/envs/uspto-patents/lib/python3.11/site-packages/indigo/indigo/indigo_object.py:3009](https://file+.vscode-resource.vscode-cdn.net/home/eloy/patent_chem/example_files/~/.pyenv/versions/3.11.3/envs/uspto-patents/lib/python3.11/site-packages/indigo/indigo/indigo_object.py:3009), in IndigoObject.countHeavyAtoms(self)
   3002 def countHeavyAtoms(self):
   3003     """Molecule method returns the number of heavy atoms
   3004 
   3005     Returns:
   3006         int: heavy atom count
   3007     """
-> 3009     return IndigoLib.checkResult(
   3010         self._lib().indigoCountHeavyAtoms(self.id)
   3011     )

File [~/.pyenv/versions/3.11.3/envs/uspto-patents/lib/python3.11/site-packages/indigo/indigo/indigo_lib.py:1001](https://file+.vscode-resource.vscode-cdn.net/home/eloy/patent_chem/example_files/~/.pyenv/versions/3.11.3/envs/uspto-patents/lib/python3.11/site-packages/indigo/indigo/indigo_lib.py:1001), in IndigoLib.checkResult(result, exception_class)
    999 if result < 0:
   1000     assert IndigoLib.lib
-> 1001     raise exception_class(IndigoLib.lib.indigoGetLastError())
   1002 return result

IndigoException: stoi

Expected behavior
Molecule being parsed

Actual behavior
it seems some items in CDX file fail to parse. The issue happens in several of the USPTO CDX files. I could upload more examples.

Attachments
US06168934-20010102-C00008.zip

Indigo/Bingo version
Indigo built from master branch, commit: 1fd76de