From 3004d20bf9261f966ece53b693405978ae2f29ba Mon Sep 17 00:00:00 2001
From: Thomas Holder <thomas@thomas-holder.de>
Date: Thu, 1 Feb 2024 09:07:15 +0100
Subject: [PATCH] WIP Don't overwrite _COb in PInit

---
 layer1/P.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/layer1/P.cpp b/layer1/P.cpp
index 33bc9b50c..f858addc5 100644
--- a/layer1/P.cpp
+++ b/layer1/P.cpp
@@ -1914,8 +1914,12 @@ void PInit(PyMOLGlobals * G, int global_instance)
     if(global_instance) {
       assert(SingletonPyMOLGlobals);
       /* implies global singleton pymol, so set up the global handle */
-      PyObject_SetAttrString(P_cmd, "_COb",
-          PyCapsule_New(&SingletonPyMOLGlobals, nullptr, nullptr));
+
+      auto cob = PyObject_GetAttrString(P_cmd, "_COb");
+      if (!cob || cob == Py_None) {
+        PyObject_SetAttrString(P_cmd, "_COb",
+            PyCapsule_New(&SingletonPyMOLGlobals, nullptr, nullptr));
+      }
 
       /* cmd module is itself the api for the global PyMOL instance */
       G->P_inst->cmd = P_cmd;