diff --git a/common/python/nomadcore/md_data_access/MDDataAccess.py b/common/python/nomadcore/md_data_access/MDDataAccess.py index f31056e50c87c6c226f541051f19ea2f3ea9cf32..53ef437740078cabd265267717de1d8c1a3d1170 100644 --- a/common/python/nomadcore/md_data_access/MDDataAccess.py +++ b/common/python/nomadcore/md_data_access/MDDataAccess.py @@ -4519,7 +4519,7 @@ class MDDataAccess(object): self.topocode is not None): topocode = self.topocode n_atoms=None - if self.topohandler is not None: + if self.topohandler is not None and topocode is not None: if "gromosread" in topocode: n_atoms = len(self.topohandler.atoms) elif "pymolfile" in topocode: