From 3dc09c38d30c04ccf08bd8b28c7b05919d0a9d53 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Sat, 31 Jul 2021 09:56:52 +0200
Subject: [PATCH] dxgsg9: Fix crash when resizing window in multi-window setup

Fixes #1167
---
 panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx b/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
index bd36f99da3..0138463260 100644
--- a/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
+++ b/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
@@ -4767,6 +4767,9 @@ release_swap_chain(DXScreenData *new_context) {
       wdxdisplay9_cat.debug() << "Swapchain release failed:" << D3DERRORSTRING(hr) << "\n";
       return false;
     }
+    if (new_context->_swap_chain == _swap_chain) {
+      _swap_chain = nullptr;
+    }
   }
   return true;
 }