From 9227c51c8ebaea315b697b551040314cbf1d4db1 Mon Sep 17 00:00:00 2001
From: Patrick Kunzmann <padix.key@gmail.com>
Date: Wed, 8 Apr 2026 14:34:50 +0200
Subject: [PATCH] Fix `PanicException` for single residues in
 `connect_inter_residue()`

---
 src/rust/structure/connect.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/rust/structure/connect.rs b/src/rust/structure/connect.rs
index 80d5957ec..5209112b4 100644
--- a/src/rust/structure/connect.rs
+++ b/src/rust/structure/connect.rs
@@ -199,6 +199,9 @@ pub fn connect_inter_residue<'py>(
 
     let mut bond_list = BondList::empty(atom_names.len());
 
+    if n_residues < 2 {
+        return Ok(bond_list);
+    }
     for i in 0..n_residues - 1 {
         // Check if residues are disconnected
         if is_disconnected[i] {