handle number only case

MDAnalysis · Jun 14, 2023 · 8069406 · 8069406
1 parent 342d9a8
commit 8069406
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/package/MDAnalysis/topology/guessers.py b/package/MDAnalysis/topology/guessers.py
@@ -205,7 +205,11 @@ def guess_atom_element(atomname):
         # strip symbols and numbers
         no_symbols = re.sub(SYMBOLS, '', atomname)
         no_numbers = re.split(NUMBERS, no_symbols)
-        name = list(filter(None, no_numbers))[0]
+
+        if (list(filter(None, no_numbers)) == []):
+            name = ''
+        else:
+            name = list(filter(None, no_numbers))[0]
 
         # just in case
         if name in tables.atomelements: