fix missing resid is 0

MDAnalysis · Jun 19, 2022 · 1eb4794 · 1eb4794
1 parent 71920b1
commit 1eb4794
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/package/MDAnalysis/core/topology.py b/package/MDAnalysis/core/topology.py
@@ -127,7 +127,10 @@ def make_downshift_arrays(upshift, nparents):
     residue_indices[u_values] = indices[1:]
 
     for missing_resid in missing_resids:
-        residue_indices[missing_resid] = residue_indices[missing_resid-1]
+        if missing_resid == 0:
+            residue_indices[missing_resid] = 0
+        else:
+            residue_indices[missing_resid] = residue_indices[missing_resid-1]
 
     downshift = np.split(order, residue_indices[:-1])
     # Add None to end of array to force it to be of type Object