diff --git a/wwpdb/utils/nmr/NEFTranslator/NEFTranslator.py b/wwpdb/utils/nmr/NEFTranslator/NEFTranslator.py
index 716a73d1..21950492 100644
--- a/wwpdb/utils/nmr/NEFTranslator/NEFTranslator.py
+++ b/wwpdb/utils/nmr/NEFTranslator/NEFTranslator.py
@@ -7013,7 +7013,7 @@ def get_valid_star_atom_in_xplor(self, comp_id, atom_id, details=None, leave_unm
             if '#' in atom_id:
                 atom_id = atom_id.replace('#', '%')
 
-            if atom_id[-1] in ('%', '*') and atom_id[-2] != "'" and self.__csStat.getTypeOfCompId(comp_id)[1]:
+            if atom_id[-1] in ('%', '*') and len(atom_id) > 2 and atom_id[-2] != "'" and self.__csStat.getTypeOfCompId(comp_id)[1]:
                 atom_id = translateToStdAtomName(atom_id[:-1], refCompId=comp_id, ccU=self.__ccU) + atom_id[-1]
 
             if atom_id[0] in ('1', '2', '3'):