From e2e9170dfa8ddcd9bce8f3376619b8993537c46c Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Sat, 17 Jun 2023 18:52:57 -0400
Subject: [PATCH] protect a couple more fixes from segfaults from errors in
 derived classes

---
 src/RIGID/fix_rigid.cpp | 2 +-
 src/fix_langevin.cpp    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/RIGID/fix_rigid.cpp b/src/RIGID/fix_rigid.cpp
index df49d84439..44427d2914 100644
--- a/src/RIGID/fix_rigid.cpp
+++ b/src/RIGID/fix_rigid.cpp
@@ -610,7 +610,7 @@ FixRigid::~FixRigid()
 {
   // unregister callbacks to this fix from Atom class
 
-  atom->delete_callback(id,Atom::GROW);
+  if (modify->get_fix_by_id(id)) atom->delete_callback(id,Atom::GROW);
 
   delete random;
   delete[] inpfile;
diff --git a/src/fix_langevin.cpp b/src/fix_langevin.cpp
index 0e083ce012..35bffb24fa 100644
--- a/src/fix_langevin.cpp
+++ b/src/fix_langevin.cpp
@@ -203,7 +203,7 @@ FixLangevin::~FixLangevin()
   if (gjfflag) {
     memory->destroy(franprev);
     memory->destroy(lv);
-    atom->delete_callback(id, Atom::GROW);
+    if (modify->get_fix_by_id(id)) atom->delete_callback(id, Atom::GROW);
   }
 }